Saving State of RecyclerView Checkbox

I'm a bit new to Android development.

I was wondering how I can save state of checkboxes in a RecyclerView. I know there are existing solutions for this, but I have a list of items in another RecyclerView that uses the same set of checkboxes. When you click an item, it should show all checkboxes and check those previously checked checkboxes for that item

Please, help. I've been trying to find a solution for weeks and I still can't find one. I just really need this for school.

Thank you!