Most likely, the emulator is copying the text to the Android Clipboard (usually set to Gboard by default). Another possibility is the android emulator doesn't recognize the cmd key on an apple keyboard the same way as a ctrl key on a normal keyboard.
Check this forum out to see if it has any solutions. In the case that it doesn't There are a few things I would try first - one of which is look for a third party app that will automatically sync clipboard between Mac and Android. Here is one that works for Windows (probably the best solution if it also works for Mac)
Alternatively, you could real quickly throw together an apk that grabs clipboard data, and sends it over. You could viably do this pretty quickly using react native. Have it detect clipboard text, and send it over localhost (probably tcp) using websockets. Most programming languages can connect and receive over tcp, so you could use your choice language to connect and read the data.