I have Custom category attribute id for ex 200.
I want to get Attribute Option label from Value in magento 2 if any clue is also much appreciate.
You can use \Magento\Catalog\Api\CategoryAttributeOptionManagementInterface::getItems service call. For example if use this call over Rest WebApi: GET http://magento2.local/rest/V1/categories/attributes/display_mode/options you get
[ { "label": "Products only", "value": "PRODUCTS" }, { "label": "Static block only", "value": "PAGE" }, { "label": "Static block and products", "value": "PRODUCTS_AND_PAGE" } ]