curl --request GET \
  --url https://{install}/api/plan/{boardId}/heatmap \
  --header 'Authorization: Bearer <token>'

{
  "resources": [
    {
      "userId": "<string>",
      "userName": "<string>",
      "resourceType": 123,
      "cycles": [
        {
          "cycleId": "<string>",
          "cycleName": "<string>",
          "plannedHours": 123,
          "capacityHours": 123,
          "utilizationPercent": 123
        }
      ]
    }
  ]
}