Local files revisited: Opening local HTML files (file:///path/to/file) in Chrome on Android 10.x

You may note the almost duplicate title from this question . It keeps coming up when trying to solve my current issue. I created a little web app to help at work. Just some HTML and JavaScript, and before Android started enforcing the Scoped Storage, I had no issues using it. Now when I try to load the URL (ie: file:///storage/emulated/0/__MyDocs/SignInTracker.html) I get an access denied error. I could use Firefox, but it seems to be because it's not yet using the Scoped Storage standard, which if I understand correctly, will be a requirement in the next Android version, so that means I cannot rely on it working in the future. Also, Firefox just doesn't run as nicely as Chrome. Is there a proper way for a non-Android-developer to use a local web app like this? Is there perhaps a location on the phone where I can place my .html and .js files that will allow Chrome to access them without issues? At work, I'm not online or connected to anything, so loading from another server/computer is not an option. For reference: My Chrome version is 79.0.3945.116, my Firefox version is 68.4.1, and my phone OS is Android 10; Pixel Build/QP1A.191005.007.A1.