let me guess… probably a Youtube extension?
after doing a search in the extensions directory App Inventor Extensions | Pura Vida Apps you could have found for example
YoutubeDataview Extension by avmcreators02 (6 USD) by using Youtube Data API
Youtube Analysis Extension by @JEWEL - user has been suspended, link is dead
Youtube Info Extension by Meulencv
Youtube API Extension by SonrajTech
Utubedetails Extension by Nami_Chand to get Youtube video details
you might want to check, if one of those extensions is able to do what you need…
Taifun