Assign values to a complex object Variable

Summary

Assign Values of subfield of a complex object fail

Content

I created an email object as page variables and I try to assing values using some page variables   as bellow :

{
 "message": {
  "Body1": {
   "content": "{{ $page.variables.Email_Body }}",
   "contentType": "Text"
  },
  "subject": "{{ $page.variables.Subject }}",
  "toRecipients": [
   {
    "emailAddress": {
     "address": "{{ \"$page.variables.Emailid\" }}"
    }
   }
  ]
 },
 "saveToSentItems": true
}

 

I've got this error

 [VB (ERROR), /vb/stateManagement/page]: TypeError: Cannot read property 'emailAddress' of undefined
    at eval (eval at createFromString (expression.js:78), <anonymous>:3:464)
    at Function.evaluateImmediate_CallReadThenEndDependencyDetection (oj3rdpartybundle.js:2336)
    at Function.evaluateImmediate_CallReadWithDependencyDetection (oj3rdpartybundle.js:2293)
    at Function.evaluateImmediate (oj3rdpartybundle.js:2258)
    at computedObservable (oj3rdpartybundle.js:2037)