How do I bind JS files to VS Code debugger for a SaaS plug-in app?

Question

I've written a vanilla Javascript application that's a plug-in for some Software as a Service we subscribe to. I haven't been able to figure out how to use VS Code's debugger with it because I don't run the app on localhost. The script files don't load in the VS Code's Loaded Scripts panel and my breakpoints are unbound.

In order to test my application, I run the SaaS's sdk in the terminal and then point a browser to mysoftwareservice.com and append ?dev=true to the URL. Then my local application appears in the browser. The sdk requires that I have Node installed, but I don't know whether my app would be considered to be a Node app or not.

The only way I have been able to successfully connect the debugger to the app in the browser is to open Edge in debug mode (cmd start msedge.exe --remote-debugging-port=9222), navigate to mysoftwareservice.com?dev=true and then use the Attach to Edge configuration in launch.json.

        "name": "Attach to Edge",
        "port": 9222,
        "request": "attach",
        "type": "pwa-msedge",
        "webRoot": "${workspaceFolder}/app"  //I've also tried ${workspaceFolder}

The debugger attaches, but my breakpoints don't work because they're unbound. How can I get them to bind?

I've had a hard time finding a solution because I don't know whether my app would be considered to be a Node app or not (The sdk requires that I have Node installed.) I also don't know whether this would be considered remote debugging.