armorpaint/paint/assets/export_presets/unreal.json

{
	"textures": [
		{ "name": "base", "channels": ["base_r", "base_g", "base_b", "1.0"], "color_space": "linear" },
		{ "name": "nor", "channels": ["nor_r", "nor_g_directx", "nor_b", "1.0"], "color_space": "linear" },
		{ "name": "orm", "channels": ["occ", "rough", "metal", "1.0"], "color_space": "linear" }
	]
}