Sending multiple pictures with Telegram Action

I do not understand exactly what you already have and what you want.

I use some Xiaomi Dafang cameras with some hacked firmware. If you use the same, i would be interested how you view the rtsp stream in openHAB.

if (CAM01_MOTION.state==ON) {
   sendTelegramPhoto("bot1", "http://<cam01-ip>/cgi-bin/currentpic.cgi", "CAM01", "<user>", "<pw>")
}

This is hardcoded, but you may as always use the appropriate Design Pattern: Design Pattern: Associated Items and Design Pattern: Working with Groups in Rules.