The easiest way is to read the digital display as often done with hobbyist radio scanner enthuseists.

If you are asking if there is an easy, universal way to tap into a radio to read the frequency to which its set, unlikely. Radio circuitry is too diverse particularly in this international forum. You might be lucky and have a radio with a digital tuner that you can probe but the odds are unlikely unless you are in some industries.

Describe your system.

aka j