How can I color a radar (spiderweb) with shading fill, just like colorbar?

I am trying to fill a radar plot (also called spiderweb) with a shading fill, just like what can be seen with the colorbar feature in 3Dplot.

The radar plot assesses 3 dimensions, that are rated from 0 to 5 (0= none, 1= very bad, … 5= very good) ; and 5 color have also been defined, corresponding to each of theses ratings.

I would like to color the inside of the shape depending on the distance of each point from the origin using the grading color scale with a shade for colors transitions.

Is this feasible with the colorbar function or any or function of TikZ?

The code of the radar plot and color:

documentclass{report}

usepackage[utf8]{inputenc}
usepackage[french]{babel}
usepackage{color}
usepackage{tikz}
usepackage{pgfplots}

definecolor{green-dark}{rgb}{0,0.2,0}

definecolor{very-good}{RGB}{25,125,90}
definecolor{good}{RGB}{90,170,130}
definecolor{neutral}{RGB}{240,170,50}
definecolor{bad}{RGB}{180,120,110}
definecolor{very-bad}{RGB}{160,50,40}


begin{document}
%% Spider chart
%% ------------
    newcommand{axisrated}{3} % dimensions
    newcommand{scale}{5} % rating scale for each dimension

    newdimenINsize
        INsize=3.5cm 
    newdimenOUTsize
        OUTsize=4.5cm
    
    % Angle between rated dimensions
    newcommand{Aradar}{360/axisrated}

    begin{tikzpicture}
        % Draw the spider web
        foreach Xradar in {1,...,axisrated}{
            draw (Xradar*Aradar:0) -- (Xradar*Aradar:INsize);
        }
        
        foreach Yradar in {0,...,scale}{
            % Axis
            foreach Xradar in {1,...,axisrated}{
                path (Xradar*Aradar:Yradar*INsize/scale) coordinate (PXradar-Yradar);
                fill (PXradar-Yradar) circle (1pt);
            };
            
            % Grid
            draw [opacity=0.2] (0:Yradar*INsize/scale)
            foreach Xradar in {1,...,axisrated}{
            -- (Xradar * Aradar : Yradar*INsize/scale)
            } -- cycle;
            
            % Axis labels
            path (1*Aradar:OUTsize) node (L1) {Axis 1};
            path (2*Aradar:OUTsize) node (L2) {Axis 2};
            path (3*Aradar:OUTsize) node (L3) {Axis 3};
        }
        
        
        % Draw the result
        draw [color=green-dark,line width=1.5pt,opacity=0.7]
            (P1-1) --
            (P2-5) --
            (P3-3) -- cycle;

        
    end{tikzpicture}
    
end{document}