armorpaint/paint/assets/export_presets/minecraft_mer.json

{
	"textures": [
		{ "name": "", "channels": ["base_r", "base_g", "base_b", "1.0"], "color_space": "linear" },
		{ "name": "normal", "channels": ["nor_r", "nor_g", "nor_b", "1.0"], "color_space": "linear" },
		{ "name": "mer", "channels": ["metal", "emis", "rough", "1.0"], "color_space": "linear" }
	]
}