UNET Send a network message to some players but not all

Hi everyone, if I have a NetworkServer and I want to send a network message to some of the players but not all, how best to go about this?

Remember, I cannot user SendToAll as I want only some clients to receive the message. Also I cannot user SendToReady or anything like for many other reasons.

Should I use make a loop and do Send to each player on the list of the ones that are supposed to receive the message? is that how the SendToAll works (sends x many messages to the x players connected, instead of some kind of broadcast)?

Apologies if this is somewhat basic, but knowledge is limited.