Prefill via POST not GET

I know how to prefill a form via HTTP GET queries…

But is it possible to prefill a form via HTTP POST fields instead so that the prefill data I’m submitting isn’t put into DNS logs or seen by MITM?

This is not possible with Airtable’s forms, but you can do something similar to what you’re looking to do with JotForm’s spreadsheet to form widget, which lets you dynamically prefill a form with dynamic values that are pulled from a spreadsheet:

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