Ah I used it more for building my own blocklists so hadn’t looked for that. Sorry that I can’t help more

Possibly try “Yet Another Call Blocker”, though I believe I had to install it using fdroid.

I first found it when I had a day of 1 spam call with the first digits matching my own number every few minutes.

Yeah, that is exactly how sponsorblock works: crowd-sourced manual identification of sponsor segments!