Oh, I thought that was the default for Choicescript. I have seen Choicescript games with a save function, and many that don't, but none that don't have one and don't autosave.
The proper save function is an additional plugin. I haven't played any games that have it myself.
The basic "remember where you left it" save is very easy to enable. It's automatically enabled on any games published with Choice of Games 😁 seems to be working through itch now too but let me know if there's issues.