Is it possible to play against a specific bot from position ?

I would like to play against specific bots available on lichess (like Boris-Trapsky) from some custom positions. Is there a way to do it on lichess (and not to play against stockfish) ? I could not find any.

And if not, can we get the code of the bot or something like that ?

Thanks in advance !

If the bots accept from position challenges, just go to Board Editor -> set up position -> click Continue From Here -> click Play with a friend -> type the username of the bot and hit enter

perfect thanks !