Print content .unknown pgfkeys

I have a lot of information to write in a genealogy tree. I would like to write part of it in the tree and the rest on the next page, accessible when clicking on the person name.

The tree is created with the package genealogytree and the data is stored in a separate file test_database.tex.

I tried to create a newcommand to print data from the database but nothing is printed. Can someone explain to me how to pass the arguments properly into new command?

The final objective is to print the data for all the people, ideally without typing each name in the newly defined command to print its data.

MWE

test.tex

documentclass{article}

usepackage[all]{genealogytree}

begin{document}
    
    % Define new keys in genealogytree database
    pgfkeys{/gtr/database/.cd,
        nationality/.store in=nationality,
        nationality=unknown,
        given name/.store in=givenname,
        family name/.store in=familyname,
        language/.store in=language
    }
    
    % Define new format for genealogytree
    gtrDeclareDatabaseFormat{xTestFormat}
    {
        % Define box title based on nationality
        ifdefinednationality
        gtrset{box={title=nationality}}
        fi
        % Define tcolorbox parameters based on 'nationality' key
        tcbset{unknown/.style={colback=black!5!white,colframe=black}}
        tcbset{french/.style={colback=blue!5!white,colframe=blue}}
        tcbset{british/.style={colback=red!5!white,colframe=red}}  
    }
    { % Define informations to print in the box
        gtrPrintSex~textcolor{blue}{textbf{givenname}}
        
        ifdefinedfamilyname
        familyname
        fi
        
        language
        
        gtrifcommentdefined{gtrPrintComment}{}
    }
    
    input{test_database}
    
    % Create a command to print people complete data
    newcommandPrintCompletePeople[1]{
            
        This is the direct output: #1
        
        I want to know what is behind the key:
        
        pgfkeys{/mydata/.cd,
            nationalitybis/.store in=nationalitybis,
            nationalitybis=pgfkeysvalueof{/gtr/database/people/#1/nationality}
        }
    
        nationalitybis
        
        but nothing is printed
    }
    
    
    begin{tikzpicture}
        
        genealogytree[
            timeflow=down,
            processing=database,
            database format=xTestFormat,
            box={nationality}
        ]
        {child[id=fam_Water]{
            p[id=Justine]{people=JustineID}
            g[id=Tom]{people=TomID}
            c[id=Jane]{people=JaneID}
            }
        }
        
    end{tikzpicture}

    newpage
    
    PrintCompletePeople{JaneID}
    
    
    
end{document}

test_database.tex

% Create database

% Jane Water
pgfkeys{/gtr/database/.cd,
    people/.is choice,
    people/JaneID/.style={
        female,
        nationality = british,
        given name  = Jane,
        family name = Water,
        language    = {English},
        comment     = {Something else}
    }
}

% Justine Random
pgfkeys{/gtr/database/.cd,
    people/.is choice,
    people/JustineID/.style={
        female,
        nationality = french,
        given name  = Justine,
        language    = {French, English},
%       family name = Random,
        comment     = {Something interesting}
    }
}

% Tom Water
pgfkeys{/gtr/database/.cd,
    people/.is choice,
    people/TomID/.style={
        male,
        nationality = british,
        given name  = Tom,
        family name = Water,
        language    = {English},
%       comment     = {There is nothing to say}
    }
}

pgfkeys{/gtr/database/.cd,people=#1}%

nationality/.store in=nationality,

documentclass{article}
begin{filecontents}[overwrite]{test_database.tex}
% Create database

% Jane Water
pgfkeys{/gtr/database/.cd,
    people/.is choice,
    people/JaneID/.style={
        female,
        nationality = british,
        given name  = Jane,
        family name = Water,
        language    = {English},
        comment     = {Something else}
    }
}

% Justine Random
pgfkeys{/gtr/database/.cd,
    people/.is choice,
    people/JustineID/.style={
        female,
        nationality = french,
        given name  = Justine,
        language    = {French, English},
%       family name = Random,
        comment     = {Something interesting}
    }
}

% Tom Water
pgfkeys{/gtr/database/.cd,
    people/.is choice,
    people/TomID/.style={
        male,
        nationality = british,
        given name  = Tom,
        family name = Water,
        language    = {English},
%       comment     = {There is nothing to say}
    }
}

end{filecontents}

usepackage[all]{genealogytree}

begin{document}
    
    % Define new keys in genealogytree database
    pgfkeys{/gtr/database/.cd,
        nationality/.store in=nationality,
        nationality=unknown,
        given name/.store in=givenname,
        family name/.store in=familyname,
        language/.store in=language
    }
    
    % Define new format for genealogytree
    gtrDeclareDatabaseFormat{xTestFormat}
    {
        % Define box title based on nationality
        ifdefinednationality
        gtrset{box={title=nationality}}
        fi
        % Define tcolorbox parameters based on 'nationality' key
        tcbset{unknown/.style={colback=black!5!white,colframe=black}}
        tcbset{french/.style={colback=blue!5!white,colframe=blue}}
        tcbset{british/.style={colback=red!5!white,colframe=red}}  
    }
    { % Define informations to print in the box
        gtrPrintSex~textcolor{blue}{textbf{givenname}}
        
        ifdefinedfamilyname
        familyname
        fi
        
        language
        
        gtrifcommentdefined{gtrPrintComment}{}
    }
    
    input{test_database}
    
    % Create a command to print people complete data
    newcommandPrintCompletePeople[1]{
            
        This is the direct output: #1
        
        I want to know what is behind the key:      
        pgfkeys{/gtr/database/.cd,people=#1}%
        nationality
    }
    
    
    begin{tikzpicture}
        
        genealogytree[
            timeflow=down,
            processing=database,
            database format=xTestFormat,
            box={nationality}
        ]
        {child[id=fam_Water]{
            p[id=Justine]{people=JustineID}
            g[id=Tom]{people=TomID}
            c[id=Jane]{people=JaneID}
            }
        }
        
    end{tikzpicture}

    newpage
    
    PrintCompletePeople{JaneID}
    
    
    
end{document}