Limited to a selection of pre-approved extensions (Ublock Origin is included in said list); however, you can get around this by using Firefox Nightly and enabling developer settings, which allows you to add a custom list of extensions, which can include any extension for desktop Firefox, including things like SponsorBlock. (Credits to https://lemmy.world/u/Pr0phet )
Firefox on Android allows extensions*. So Firefox + Ublock Origin + YouTube mobile site.
*Limited to a selection of pre-approved extensions (Ublock Origin is included in said list); however, you can get around this by using Firefox Nightly and enabling developer settings, which allows you to add a custom list of extensions, which can include any extension for desktop Firefox, including things like SponsorBlock.
This! Given the premiss that you still use YouTube and not invidious or piped, there's no need to have another app on your cellphone (unless you really like it, and enjoy the app customization that revanced allows to for instance).
Mull + uBlock Origin+ SponsorBlock + script in uBlock to hide Shorts, I feel you don't need anything else :)