This can be done with localstorage, but it needs a custom script (though it’s not as involved as one might think).
Add buttons for save and load. Then insert a custom embed on the page with the form and write a script that saves the form values when the save button is clicked and fetches them when the load button is clicked.
Here’s how you set up onclick on the buttons:
Here’s how you set and get localstorage values:
You could do the save part automatically through a set interval like this:
but remember that this will overwrite the previous save, so if the user clears out the form manually it’ll save it as blank on the next interval.