Append form input to contact field

I have a form on my website that allows a customer to ask a question.
I created a custom TEXTAREA field to store this form input field and this works.
I would like that if a customer posts multiple times in this form, that all questions can be saved for review in the custom field. So basically, I would like the option that a form submit actions appends the info of a specific form field to a specific contact custom field, an not overwrite the info in the contact’s info.
Is this possible? If not please submit as feature request.
Regards,