RFID clips for Bambu original reusable spools, simply cut a RFID chip from an empty roll and glue it inside the clip (i've used double sided tape).
You can use only one tag per spool if you place it on the side of the sensor is in the AMS (Sensors are in pillars between 1 and 2 or 3 and 4).
The text is editable in Bambu studio, check the picture in the documentation area.