No. But the idea or similar ones have come up before and are in the devs’ radar, largely though if as similar to multi-reddits, which were an established feature there.
There is an issue opened about this, I suggest posting a bounty on rysolv (or some other bounty platform if you think it is better), it might make the implementation faster.
If you want a feature implemented, the best way is to do it yourself. In this case it could be helpful to write something like an rfc to describe how exactly the feature can be implemented on a technical level in the Lemmy code. Or implement it directly yourself, but that will be difficult.
But if someone will post it on a platform and some third party freelance developer will implement it to get the money you won't have a problem right?
The biggest advantage of bounties is that they give users a way to incentivize directly, people usually say to a developer "you are not your user" and developers might prioritized the wrong thing, a good bounty platform can create a market for contributions that will enable to estimate their worth, it also gives a bigger incentive to give money. Not saying it is the ultimate solution (which doesn't exist) but as part of a funding plan it can be very useful in the highly competitive world of software development.
I know bounty source was linked in the issue template before, I suggest linking to rysolv in the issue template now (there are reportedly serious problem with bounty source now), because lemmy has now 65K active users it should work a lot better then when it had 1k.
If you want a feature implemented, the best way is to do it yourself.
tbh i don't have the motivation to do more coding, And I am sure there are more like me (or people who just can't code), I think there is a reason why the best big open source projects have a variety of sources of fundings, It's hard to compete with closed source software.