Seems like the android-15 tags of boringssl have X25519Kyber768 and HEAD supports MLKEM768X25519, but I can't seem to take advantage of either; apps throw a handshake failure when connecting to a server that only offers those post-quantum hybrids. You can find test endpoints for MLKEM and Kyber on test.openquantumsafe.org.
Does anyone have this working or is it missing somewhere in the Android source?