ItemCategoryUserFieldTable::getUserFieldsByEntityCategory

static function getUserFieldsByEntityCategory(int $entityTypeId, int $categoryId): array
{
	return static::getList([
		'select' => ['USER_FIELD_NAME'],
		'filter' => [
			'=ENTITY_TYPE_ID' => $entityTypeId,
			'=CATEGORY_ID' => $categoryId,
		],
	])->fetchCollection()->getList('USER_FIELD_NAME');
}