Sending an array within the form Submission object

Hi all, I'm sending a JSON to the database with the function:

return Object.fromEntries(

Array.from(StudioForm.acfinder_form.data.form.entries()),

);

I only get the last value in the variable data.input_property_type. I need multiple selections from my checkbox question.

{ "input_property_type": "Listed Building", "input_room_type": "Bedroom 3", "input_allowed_external_unit": "No", "first_name": "Ian", "email": "ian@dededede.com", "send_free_guide": "on", "last_name": "Hancock", "phone": "456645645", "message": "Test message ", "consent": "on" }

"input_room_type": "Bedroom 3" should have multiple values e.g. "input_room_type": "Bedroom 3, Bedroom 1, Bedroom 2"

How do I achieve this? What am I doing wrong?

Thanks in advance!

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