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HTTP would be fine as well, you could GET an XML with the form to fill and POST the XML with form data.

But: - HTTP forms might be less flexible when it is about structured data. - HTML needs a complex renderer software

Remember that this stuff might need to work on low resource devices and over low bandwidth connections.

Sounds similar to WinLink forms on ham radio, used to make sending structured data easier: https://www.winlink.org/WinlinkExpressForms

I happen to have been an avid user of the Lynx web browser. A long time ago yes but I still remember it.

HTML forms are pretty flexible and could be designed in a low CPU environment.