I do not know what drivers are loaded by default, but you need a driver and as USB is loaded I should think that’s it. The driver name should start kmod-rtl818xxxx… There are a few but none say 8188E, so you might have to try them all and may find none work.

If it works it should pretty much show up under Luci=> Networking=> wifi as Radio1. A partly supported device may show, but have problems connecting.

Unfortunately I have not found a good resource for Device\Driver that is supported in OpenWrt.

This is a good site to have for reference: https://wikidevi.com/w/index.php?search=rtl-8188&title=Special%3ASearch&go=Go