Hoe can I retrieve an Opportunity using a UDF?

I am trying to retrieve an Opportunity using a UDF but I am getting this error:

{
  "Code": -1,
  "Msg": [
    {
      "Message": "Query: /Opportunity doesn't support property \"Udf/$NAME(EST-WO #)\" OpportunityObject",
      "ErrorCode": 0
    }
  ]
}

My query is:

{
  "Opportunity": {
    "Scope": {
      "Fields": {
        "Key": 1
      }
    },
    "Criteria": {
      "SearchQuery": {
        "Udf/$NAME(EST-WO #)": {
          "$LIKE": @{variables('Number')}
        }
      }
    }
  },
  "Compatibility": {
    "AbEntryKey": "2.0"
  }
}