Hi Nick,
I wrote a little widget a while back for exactly this purpose: https://appstore.home.mendix.com/link/app/52055/Mendix/LocalStorage-Reader-and-Writer
Keep in mind that you should still ensure that your entity access is setup right so that users can only view the data that they should be able to, but that widget is helpful to persistent data on the user's device for use later.
I hope this helps!
Thanks,
Conner