They already exist, unfortunately they are barely supported by clients:
nostr:naddr1qvzqqqr4gupzq77777lz9hvwt86xqrsyf2jn588ewk5aclf8mavr80rhmduy5kq9qq08qunfweshgefdd35hxarn94ehgunpw3jkw6trv9kz6ar0dakq5gdjsw
Discussion
I also already pinged nostr:npub1syjmjy0dp62dhccq3g97fr87tngvpvzey08llyt6ul58m2zqpzps9wf6wl about this matter:
Let's create a bounty. I created some bounties on lightningbounties.com and people are accepting.
Later I will create one for private follow list and I will let you know, so you and others can contribute with sats if you want.
I created a bounty here https://app.lightningbounties.com/issue/efc411f6-ed4f-404e-abf4-de32dd6c5b9c
Please contribute if you can.
yes. we need more clients supporting it.