Dynamic Dashboard Background based on Entity

Hi you all,
I really hope someone can help me with this, imho, simple problem of just changing the dashboard background image dynamically based on an entity.
I’m using HA ver. 2024.5.4.
I tried everything, including the HACS integration ‘Animated Lovelace Background by Villhellm (R.I.P.)’, as well as the forks from that addon, but nothing seems to work.
On Google I can’t find a solution either.
Of course I’m able to set the dashboard background statically in the raw config editor.

BTW, I do not use a theme…