Default password for every room jitsi meet flutter

I want to set up default password for my room like you don’t have tu set it up during the stream or the call .
I think the only way to do it is to change code in the plugin files in flutter sdk but i don’t know how .
if anyone knows an answer please answer me .

This is handled on the backend, with custom modules.

how can i handled it with node js ?? any ideas ??

Nope, this is inside prosody which is lua.