How to remove pictures from a specific Viber chat?

Question

Messengers

I want to clean some Viber chats from multimedia.
How to select and delete on the phone only those photos / videos that are in a specific chat / group / community?
If you just leave the community, then its media is not cleaned either on your phone or on your computer.
You can delete 1 piece until the end of the century - they will appear faster than I will clean.
It needs to be massive.

Answer 1

programmatically

Answer 2

Brilliant!
How to match pictures with a chat/group/community?
Is there a criteria/algorithm?
I can even write a program myself. I just don't have enough information.