As far as I know (fairly unknowledgeable about Open GL ES2), on Android it is possible to turn it on with a particular EG config spec. But not every device provides support, so you need to fallback to a config that has multisampling turned off.
Apple provides the glRenderBufferStorageMultisampleAPPLE extension which I haven’t taken a closer look.
I had noticed bindings for glSampleCoverage, and also not particularly knowledgeable about es2, but wanted to check and make sure there wasn’t an easy switch to flip on for an early demo. Thanks, sounds like I’d have to handle antialiasing manually.