Seems like you already have a decent interface working in webview. I would try it in a UXP webview to see if everything works interface wise. If so, you can create a uxp plugin that shows that webview and listens for messages that trigger your imports or whatever you need to do.
One limitation with uxp webview is that it cannot load local files. So, you would either need to run that page on a webhost or run a server. Although the rumor is they may be opening up local files later this year.
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