Use a simple batch script ( for %i in (*.cue) do chdman createcd -i "%i" -o "%~ni.chd" ) to convert your entire library instantly.
Once your files are converted, you do not need to do anything extra. Simply point your emulator to your new CHD folder. The following prominent Android emulators support the format out of the box:
Compression requires processing power and temporary storage space. Ensure your phone has at least as much free space as the size of the uncompressed game you are converting.
You can run the standard chdman tool locally by installing the mame-tools package within Termux.