I would like to know if steam saves can be migrated to an itch.io title?

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.

There is no such thing as a Steam or Itch save.

If you have the same game on both or more platforms, the chance is high, that they even share the same save game on the same computer.

Steam syncs save games in a cloud. The Itch app does not do this.