Local files revisited: Opening local HTML files (file:///path/to/file) in Chrome on Android 10.x
You have 2 options:

You can use a local web server in your Android phone itself. There are many server apps out there in the Play Store, one such app is Simple HTTP Server.

You can put your documents into the folder Android/data/com.android.chrome/files/Download/ in the internal storage. It's absolute path is /storage/emulated/0/Android/data/com.android.chrome/files/Download/ or /sdcard/Android/data/com.android.chrome/files/Download/. This is the location where Chrome stores any downloaded files and therefore, this the only location where Chrome can access the files. But remember, uninstalling Chrome will delete this directory.