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You can use the Mist and Flood pins of grbl. Mist is enabled with gcode of M7, Flood is enabled with M8 and both are turned off with G9.
Mist is level shifted to 5V if you use the Mist Pin on the 14 pin connector.
In Lightburn you'd enable these features by first making sure you turn off air assist in all layers.
Then we manually take control of Mist and Flood with Starting and Ending gCode in Lightburn 0.9.15 and above as follows.
You can order a buzzer from Digikey (Example from Murata Digikey part num 490-4688-ND)
Plug in the 14pin ribbon cable between the EleksMana and Eleksextra. Wire up the limit switches to the Eleksextra. Then if you close a switch, an LED on the Eleksextra will light up. This means wiring is complete. Then move the motors far away from the switches and power off everything. Then set $21=1, $22=1. This enables the homing cycle. No perform a homing cycle $h at the console or hit the home button in Lightburn. If during homing, it moves in the correct direction for x and y you're done. If wrong direction for only x, set $23=1, if wrong direction for only y set $23=1, if fit starts homing in the wrong direction for both x AND y, set $23=3. Anytime it starts moving in the wrong direction you press the power button to turn off the EleksMana board and then pull the USB cable to completely reset it, set $23 as described and try again.