feature request: share board editor with another player (players)

2 or more players on the same board editor moving pieces. It could be used to analyse game together, or to play your own chess variant, like bughouse

it would be awesome so we could do some analysis with friends

Just like on playchess.com after the game you can request control over the board and analyse with opponent. Or use it to finish game in case of time lost, play from some position again, etc.
Also a lot of variants that hard to implement on lichess, could be possible to play.