Form Field: Multi-Select Checkbox, bulk import choices

I have an internal-use form where I need my team be able to multi-select from a list of 300+ choices.
the multi-choice checkbox field is what I need, but I’m only able to enter/edit choices one at a time. Is there a way to import a delimited file and have those connect to the checkbox values? I’ve found a couple tutorials for doing this with collections and a dropdown, but they don’t work with the checkbox field.