If you have the same account on the devices and the songs/playlist are local files, you could listen them in your car. Remember that you have to download the playlist on your cellphon if you wanna listen without your Mac.
On the other hand, yes you can listen to your favorite music 🎶 from Google Home. You just have to link your Spotify account to it. Also you can ask for songs/artists/playlist and you will listen on your Google Home 🙌🏽