Webhook technician details

Webhook technician details

I want to send a notification to Rocket.Chat user when a ticket is updated/responded.
I created a webhook with the content below.
  1. {
  2.   "alias": "Helpdesk",
  3.    "channel": "@username",
  4.   "avatar": "http://192.168.2.16/img/logo_sdpplus.png",
  5.   "text": "Nova resposta chamado ${{request.id}}",
  6.   "attachments": [
  7.     {
  8.       "title": "${{request.subject}}",
  9.       "title_link": "http://sdp-url/WorkOrder.do?woMode=viewWO&woID=${{request.id}}",
  10.       "color": "#3244a8",
  11.       "text": "${{request.technician}}",
  12.       "fields": [
  13.         {
  14.           "short": true,
  15.           "title": "Status",
  16.           "value": "${{request.status.name}}"
  17.         },
  18.         {
  19.           "short": true,
  20.           "title": "Dt. Vencimento",
  21.           "value": "${{request.due_by_time.display_value}}"
  22.         }
  23.       ]
  24.     }
  25.   ]
  26. }
Now I need to pass the request technician to @username so on the technician details page I filled the employee_id as "@kelsen.faria" but how can I get that information?

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