OPC UA Client Configuration from a custom webpage. {It is not a Issue/Bug}

I want to collect Endpoints, Username, and Password from a custom local webpage. From the webpage, the user can add the Endpoint URL and other connectivity details without opening Node-Red dashboard. I want to keep Node-Red under the hood.
Is it possible to do it on Node-Red?

Yes.

Create a web page using @flowfuse/node-red-dashboard, node-red-dashboard, uibuilder or DIY a dashboard using the HTTP in & HTTP response nodes. The user will access the web page you create and never know about (or see) the node-red flow editor.