[Feature request] Make it easier to specify spacing in between titles and subtitles

I really appreciate the subtitle parameter within Plotly Express charts. However, I'm finding that, when I use title_y to update the title's location, the subtitle's location doesn't follow accordingly. This can result in unsightly gaps between the title and subtitle.

Would it be possible to add a subtitle_y dimension that would let me adjust the spacing between title and subtitle elements? I suppose subtitle_x would be handy also in case some users want a horizontal offset between titles and subtitles.

Here are some screenshots for reference. First, in this chart, I'd like to move the title and subtitle up to increase the spacing between those elements and my legend:

I can set title_y to 0.98 to move it farther from the legend; however, the y position of the subtitle moves up only a little, thus increasing the gap between the two.

If there were a corresponding subtitle_y parameter that I could adjust, I would be able to easily resolve this issue. (In the meantime, I can get around it by creating subtitles via add_annotation.)

Thank you in advance for your consideration and help!

Commencez par examiner le comportement de Plotly Express concernant le positionnement du sous-titre et du titre, en particulier la manière dont title_y affecte le sous-titre ; comparez-le avec le contournement actuel utilisant add_annotation. La tâche sera considérée comme terminée lorsque les utilisateurs pourront contrôler indépendamment les décalages vertical et horizontal du sous-titre sans l’espace indésirable, et lorsque le comportement sera documenté et couvert par des vérifications appropriées.