Do you mean you want something like the Bluesky/ AT-Protocol 'relay' to exist for the Fediverse/ ActivityPub?
The Fediverse does have 'relays'. Although people tend to use them a little differently here.
But, I have (previously) talked about using Fediverse 'relays' for other use-cases. For example:
https://mastodon.social/@reiver/114475295509631311
.
