You would need to get the form element (e.g. assign it an id <form method="dialog" id="myForm">, get a reference to it in your code (document.getElementById('myForm')) and then, you could use this code. I’d also suggest returning a new Promise which you manually resolve when onsubmit() gets called instead of showModal() – this allows you to get all your code in there (you could – for example – resolve this with an object containing options a user has selected and use the result you await elsewhere to do what your plugin should do).
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