How to install gnome-podcasts on L5?

I have been searching here, but found no solution of how to install gnome-podcasts. With apt I notice it’s not on debian’s or purism’s repos, do I need to install it via flatpaks?

Yep. The web page makes discoverability easy. I usually install from there, and manage flatpaks from the terminal.

Must be the same procedure as with mobian, right?[]=podcasts

Yep. That’s how I do it if I know the full package name beforehand.