If you go through a ton of hoops, you should be able to get sponsorblock on firefox android.

It requires getting firefox beta, logging into your account. On, a pc, going to the mozilla addons website, logging in, creating an addon list. Then enabling addon lists in firefox beta. I found this which helped me, but the addon I wanted to use (libredirect) wasn’t available on android. it does say firefox nightly, but I couldn’t find the option, only ok firefox beta