Assemble a short js script on requests for the browser (submit a form)

There is a certain form of submission on a third-party site (map binding), you need to make a js script to fill out and submit this form with one click, filling in the fields in the script in advance. There is a sample, but it performs a slightly different task. You need to do it on requests (track where and what requests are sent when sending a form and repeat them in a script) If you know how queries work in js, then I think it is not difficult to do.