Can anyone point me to a reliable French Media Bias Chart, please? I am looking for an equivalent of adfontes media bias chart for French media.
There is unfortunately still no adfontes-style, comprehensive graphic in reference to the French media. However, there have been a number of studies analyzing the French public's perception of the media as well as media consumption habits along political cleavages.
For instance, the best source for your inquiry might be this Pew Research article which measures perceptions of the media and should give you an idea as to the perceived bias of the French media. From there, you might have to interpolate.
See also this graphic from the French publication "Marianne," which shows which outlets are preferred by those who place themselves on the political left and right.