Fill PDF operation: how do I handle check boxes?

On my app, I have a checkbox list where a user can select multiple options, and that corresponds to a PDF with identical checkboxes that I need to fill in with their choices. how do i map the checkbox selections from checkbox list in the fill PDF data operation?

I’ve never done this before, but this seems like an adobe pdf thing. I tried to use a boolean value to mark the checkbox but it didn’t work that well. What i’ve seen as a workaround, is use a text input in the PDF and mark it with an x when preparing the form.