zmk/app/dts/behaviors/key_press.dtsi

#include <dt-bindings/zmk/hid_usage_pages.h>

/ {
	behaviors {
		kp: behavior_key_press {
			compatible = "zmk,behavior-key-press";
			label = "KEY_PRESS";
			usage_page = <HID_USAGE_KEY>;
			#binding-cells = <1>;
		};

		cp: behavior_consumer_press {
			compatible = "zmk,behavior-key-press";
			label = "CONSUMER_PRESS";
			usage_page = <HID_USAGE_CONSUMER>;
			#binding-cells = <1>;
		};
	};
};