Key Word in Bibliography

Question

I have following problem.
My professor wants me to have following footcite style and bibliography style.

The footcite has got a keyword, in this case "Bilanzen" and this is displayed in the brackets in the bibliography.
Here is my MWE:
documentclass[12pt,a4paper]{article}
usepackage[backend=biber,style=authortitle-ibid,giveninits=true,maxbibnames=99]{biblatex}
usepackage[perpage]{footmisc}
usepackage[german]{babel}
DeclareNameAlias{sortname}{family-given}
DeclareNameAlias{labelname}{family-given}
renewcommand*{multinamedelim}{addtextbackslashspace}
renewcommand*{finalnamedelim}{multinamedelim}
begin{filecontents}{myreferences.bib}
@book{bilanz,
    address = {D{"u}sseldorf},
    author = {Baetge, J{"o}rg and Kirsch, Hans-J{"u}rgen and Thiele, Stefan},
    date-added = {2021-03-26 12:37:04 +0100},
    date-modified = {2021-03-29 16:08:56 +0200},
    edition = {14},
    publisher = {},
    title = {Bilanzen},
year = {2017}}
end{filecontents}
addbibresource{myreferences.bib}
begin{document}
Im Handelsrecht gibt es bzgl. der weiteren Handhabung keine speziellen Vorgaben, daher muss auf das Steuerrecht und die Einkommensteuerrichtlinien zurückgegriffen werden. Bei Gebäuden muss zusätzlich die Art der Nutzung berücksichtigt werden.footcite[Vgl.][S.35]{bilanz}
printbibliography
end{document}

Thank you for your help.

moewe · Accepted Answer

The following code uses the approach authoryear takes to print the year directly after the names in the bibliography.
It is implied by your comment, but just to make it explicit: The solution is based on the automatically generated labeltitle, which can take its value from the title field or from shorttitle.
documentclass[12pt,a4paper]{article}
usepackage[perpage]{footmisc}
usepackage[ngerman]{babel}
usepackage{csquotes}
usepackage[
  backend=biber,
  style=authortitle-ibid,
  maxbibnames=99,
  giveninits=true,
]{biblatex}

DeclareDelimFormat{multinamedelim}{addslash}
DeclareDelimAlias{finalnamedelim}{multinamedelim}

DeclareNameAlias{sortname}{family-given}
DeclareNameWrapperFormat{sortname}{mkbibemph{#1}}

DeclareNameAlias{labelname}{family-given}

DeclareDelimFormat{nametitledelim}{addspace}
DeclareFieldFormat*{title}{#1}
DeclareFieldFormat*{citetitle}{mkbibparens{#1}}

DeclareDelimFormat[bib]{nametitledelim}{addcolonspace}

makeatletter
renewbibmacro*{author}{%
  ifboolexpr{
    test ifuseauthor
    and
    not test {ifnameundef{author}}
  }
    {usebibmacro{bbx:dashcheck}
       {bibnamedash}
       {usebibmacro{bbx:savehash}%
        printnames{author}%
        setunit{printdelim{authortypedelim}}}%
     iffieldundef{authortype}
       {}
       {usebibmacro{authorstrg}}}%
    {globalundefbbx@lasthash}%
  setunit{addspace}%
  printfield[citetitle]{labeltitle}}

renewbibmacro*{editor}{%
  usebibmacro{bbx:editor}{editorstrg}}
renewbibmacro*{editor+others}{%
  usebibmacro{bbx:editor}{editor+othersstrg}}
newbibmacro*{bbx:editor}[1]{%
  ifboolexpr{
    test ifuseeditor
    and
    not test {ifnameundef{editor}}
  }
    {usebibmacro{bbx:dashcheck}
       {bibnamedash}
       {printnames{editor}%
        setunit{printdelim{editortypedelim}}%
        usebibmacro{bbx:savehash}}%
     usebibmacro{#1}%
     clearname{editor}}%
    {globalundefbbx@lasthash}%
  setunit{addspace}%
  printfield[citetitle]{labeltitle}}

renewbibmacro*{translator}{%
  usebibmacro{bbx:translator}{translatorstrg}}
renewbibmacro*{translator+others}{%
  usebibmacro{bbx:translator}{translator+othersstrg}}
newbibmacro*{bbx:translator}[1]{%
  ifboolexpr{
    test ifusetranslator
    and
    not test {ifnameundef{translator}}
  }
    {usebibmacro{bbx:dashcheck}
       {bibnamedash}
       {printnames{translator}%
        setunit{printdelim{translatortypedelim}}%
        usebibmacro{bbx:savehash}}%
     usebibmacro{#1}%
     clearname{translator}}%
    {globalundefbbx@lasthash}%
  setunit{addspace}%
  printfield[citetitle]{labeltitle}}
makeatother

begin{filecontents}{jobname.bib}
@book{bilanz,
  address = {Düsseldorf},
  author  = {Baetge, Jörg and Kirsch, Hans-Jürgen and Thiele, Stefan},
  edition = {14},
  title   = {Bilanzen},
  year    = {2017},
}
end{filecontents}
addbibresource{jobname.bib}

begin{document}
nullvfill % only for the example
Im Handelsrecht gibt es bzgl. der weiteren Handhabung keine speziellen Vorgaben,
daher muss auf das Steuerrecht und die Einkommensteuerrichtlinien zurückgegriffen werden.
Bei Gebäuden muss zusätzlich die Art der Nutzung
berücksichtigt werden.autocite[Vgl.][35]{bilanz}
printbibliography
end{document}

Key Word in Bibliography

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