Bubble-Card - picture as icon

[Nexow91]

Picture instead of icon.

Hello first of all many thanks for the beautiful love-ace I am desperately trying to use a picture for the main button that is under "/local/".
For the subbuttons there is the wiki (readme in the repo) which works but I have all variables like ".bubble-button" unfortunately this does not work.

Is it even possible to use an image instead of an icon for the main button?

I have also tried it with these variables without success.

show_entity_picture: true
entity_picture: /local/icons8-autodesk-24.png

Is there any other way to use .png instead of icons (mdi:switch) ?