Custom scriptlets is amazing, Is there a plan to make it use external scripts?

Today I just found out that Nightly build has a new feature which is Custom Scriptlets.

I tried it, and it surprisingly works amazing. But surely it can get improvement like adding support to add external script, for example TwitchAdSolutions, which eliminating us as an user to update the script manually whenever it breaks

Thanks

Related to GitHub ticket https://github.com/brave/brave-browser/issues/43916