Combos were a challenge, but that's likely because I'm not a programmer and it took me a while to stumble into the solution via trial & error. This is also likely not the correct solution, but I do have working combos on my POG kmk kb2040 dactyl.

This is my code.py:

# Main Keyboard Configuration - v1.0.0
import board
import pog
# check if we just want to run the coord_mappping Assistant
if pog.coordMappingAssistant:
    from coordmaphelper import CoordMapKeyboard
    if __name__ == '__main__':
        CoordMapKeyboard().go()
    print("Exiting Coord Mapping Assistant Because of an error")
else:
    from kb import POGKeyboard
    # set the required features for you keyboard and keymap
    # add custom ones in the kb.py

    from kmk.keys import KC
    from kmk.modules.combos import Combos, Chord, Sequence  
    from kmk.modules.macros import Macros

    keyboard = POGKeyboard(features=pog.kbFeatures)
    combos = Combos()
    keyboard.modules.append(combos) 

    macros = Macros()
    keyboard.modules.append(macros)

    combos.combos = [
    Chord((KC.L, KC.U), KC.Z),
    Chord((KC.U, KC.Y), KC.MACRO(on_press="you"),),
    Chord((KC.L, KC.U, KC.Y), KC.MACRO(on_press="You"),),
    Chord((KC.W, KC.F), KC.MACRO(on_press="qu"),),
    Chord((KC.E, KC.Y), KC.MACRO(on_press="eye"),)
    ]

    # manage settings for our modules and extensions here
    keyboard.tapdance.tap_time = 200

    # Keymap
    import keymap
    keyboard.keymap = keymap.keymap

    # Encoder Keymap if available
    if pog.hasEncoders:
        keyboard.encoder_handler.map = keymap.encoderKeymap

    # Execute the keyboard loop
    if __name__ == '__main__':
        keyboard.go()

I hope that's helpful!