Agree that officials should not step forward to administer first aid, but don't let that prevent you from being CPR trained for life-threatening situations on or off-the-court.
I renewed my training recently, and the big takeaway was emergencies happen everywhere and at any time, particularly in your own home or office. Being prepared to sustain a loved one until paramedics arrive is worth the six-hour training.
Training includes understanding complex good Samaritan laws and negligence if you are in a position of authority. Especially relevant if officiating in small school or rec situations where resources might be slim or none.
For more info:
CPR, First Aid and AED Certification | Red Cross
Might even make for a productive association activity. Be safe out there...