Without getting to wild, you’d need a DPDT switch for each switch (the bottom circuit already has one). On the unused portion of the switch, you’d wire the LED.
9V (battery or adapter) > resistor (2k2 to 47k, whatever gets you the brightness you want (higher values for ultra brights)) > anode of LED. Cathode of LED to the outside lug of the unused potion of the switch, ground to the middle.
Depending on if you want the LED to light up when you are silenced or not silenced, you’d need to wire the cathode of the LED to either outside lug.