I don't know about MacOS, but Microsoft's native OpenSSH supports this configuration.

    C:\>ssh -vv me@myDJBserver.myco.com
    OpenSSH_for_Windows_8.1p1, LibreSSL 3.0.2
    ...
    debug2: KEX algorithms: curve25519-sha256@libssh.org
    ...
    debug2: ciphers ctos: chacha20-poly1305@openssh.com
    debug2: ciphers stoc: chacha20-poly1305@openssh.com
    ...
    debug1: kex: server->client cipher: chacha20-poly1305@openssh.com MAC: <implicit> compression: none
    debug1: kex: client->server cipher: chacha20-poly1305@openssh.com MAC: <implicit> compression: none
    ...
    $

Above you can also see that the MAC is implicit with the chosen AEAD cipher.