keychron_qmk_firmware/keyboards/xd004/keymaps/default/keymap.c

#include QMK_KEYBOARD_H

const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {

    // 0: Base Layer
    LAYOUT_all(KC_L, KC_O, KC_V, KC_E),

};

// Loop
void matrix_scan_user(void){
    // Empty
};