It depends.
In general, the answer is NO, Itch and Steam are not compatible and therefore there are no tools or ways to move saves between both platforms.
However, in many games, the saves are nothing more than a file or a folder with several files and that structure does not usually change.
In those cases, it would be possible to manually move the files, but this depends on each game.
It is best to ask directly on the page of the game you are interested in, so that the developer of that game can see and answer your question.