if u can add video sources using this "lightstream" then it should work the same as obs. if not, you should probably just use obs tbh
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you should have probably started with that, that's an entirely different question. I don't know much about chromebook (i wasn't even aware chromeOS was linux based until i looked it up just now) but if you can figure out how to run the linux x86_64 from the download page it might be able to open https://www.reddit.com/r/chromeos/comments/l5l9q2/how_do_i_run_a_x86_64_file/
chromebooks are generally very locked down though so even if you manage to get the program to run I have no guarantees the software will function correctly