I can't use helper functions in json body

[niudaii]

id: xxxx

info:
  name: xxxx
  author: zp857
  severity: critical
  description: xxxx
  reference: xxxx
  tags: xxxx

requests:
  - raw:
      - |
        POST /xxx HTTP/1.1
        Host: {{Hostname}}
        Content-Type: application/json
        
        {
          "xxx": "{{rand_text_alpha(11)}}",
          "yyy": 1, 
        }

    matchers-condition: and
    matchers:
      - type: word
        words:
          - "xxxxx"

When I use the above file the following happens, if I remove the double quotes outside {{}}, I can use the helper function.

id: xxxx

info:
  name: xxxx
  author: zp857
  severity: critical
  description: xxxx
  reference: xxxx
  tags: xxxx

requests:
  - raw:
      - |
        POST /xxx HTTP/1.1
        Host: {{Hostname}}
        Content-Type: application/json
        
        {
          "xxx": {{rand_text_alpha(11)}},
          "yyy": 1, 
        }

    matchers-condition: and
    matchers:
      - type: word
        words:
          - "xxxxx"

[forgedhallpass]

The issue will be fixed in: #1419