How to populate a backend form with values from remote json file, and how to trigger an HTTP request on form submission?

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We have some editors who attach standard forms to pages. Each of these forms need to contain a number, which the editor will need to choose from a drop down when editing the page and setting up the form. The entries for this form comes from a remote json file that needs to be loaded, parsed, and displayed as a drop-down.

How do I do that?

Also, whenever a visitor submits this form, this number needs to be HTTP posted to an external url.

How do I do that?

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