I’ve stumbled upon Surf-TG, a “Python Web App which Indexes a Your Telegram Channel and Serves its Files for Download and and Stream.” What a brilliant concept! I know bringing something like this to Stash might be a massive effort, so I’m just putting the idea out there. Since it’s open-source, perhaps some developers will be inspired to take a look. Here’s the GitHub link: (GitHub - weebzone/Surf-TG: Python Web App which Indexes a Your Telegram Channel and Serves its Files for Download and Stream.).
I think this is definitely suited more towards a third-party plugin/script than a core feature.