Group Related Entity

{
   "relatedEntities":{
      "Task":[
            "00Txx000003rIRU",
         "00Txx000003rIUi"
      ],
      "CaseParticipant":[
         "1caxx00000000BL"
      ],
      "ContentDocumentLink":[
         "06Axx0000004C93"
      ],
      "Case":[
         "500xx000000bod7",
         "500xx000000boej"
      ],
      "Contact":[
         "003xx000004Wi5Q"
      ],
      "PublicComplaint":[
         "0fhxx000000006T"
      ],
      "WorkOrder":[
         "0WOxx0000000001"
      ],
      "CarePlan":[
         "1spxx000000003F"
      ],
      "Opportunity":[
         "006xx000001a332",
         "006xx000001a34e",
         "006xx000001a36G"
      ],
      "Lead":[
         "00Qxx000002TRbO"
      ],
      "Entity1__c":[
         "a01xx000003GaSF"
      ],
      "Asset":[
         "02ixx0000004HHi"
      ],
      "Allegation__c":[
         "a00xx000000bobV"
      ],
      "Contract":[
         "800xx000000bohx"
      ]
   }
}