You may note the almost duplicate title from this question. It keeps coming up when trying to solve my current issue.
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.