How to filter populated data

Discord Q&A strapi-questions
1

I refered to following doc, but i am unable to filter data after populate,
API: /api/categories?populate[merchant][filters][slug][$eq]=SPECIFIC

Expected Response: I want only category with id: 1, becuase id: 2’s merchant is not same as SPECIFIC

Current Response:

{
  "data": [
    {
      "id": 1,
      "attributes": {
        // ... some data
        "categorySlug": "paintings",
        "merchant": {
          "data": {
            "id": 1,
            "attributes": {
              "slug": "truedesignshop",
            }
          }
        }
      }
    },
    {
      "id": 2,
      "attributes": {
        // some data...
        "merchant": {
          "data": null
        }
      }
    }
  ],
  "meta": {
    "pagination": {
      "page": 1,
      "pageSize": 25,
      "pageCount": 1,
      "total": 2
    }
  }
}

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