document
class{article}
usepackage{amsmath}
begin{document}
    begin{figure}[!t]
        centering
        subfloat[caption a. ]{label{interp}includegraphics[width=0.5textwidth]{figures/abs.png}}
        subfloat[caption b.]{
           begin{tabular}{@{}lllll@{}}
           J    & 0.0 & 0.25   & 0.5    & 1.0    \
           300  & 0.0 & 25.07  & 50.14  & 100.28 \
           kWh: & 0.0 & 125.00 & 250.00 & 500.00
           end{tabular}  }
        caption{common caption.}
        label{interp}
    end{figure}
cref{interp} shows ..
end{document}