Changing the background of the Zoom Room

I’d like to show some static background in the Zoom Room, but to change it temporarily to another one after the meeting. If I understand correctly, there is currently no way to programmatically switch the background image of a Zoom Room. Digital Signage shows the images in the loop, so if I place two images there, they will replace one another constantly, while I would like to run the loop only once (or, as an equivalent, to have the infinite showing time for the last image of the digital signage).

Describe alternatives you’ve considered
I’ve asked for a way to switch the background images programmatically, but was told it’s currently impossible.

This is needed for showing something like “Thank you for calling us” message after every call.