Custom field with value code not formatting json properly [#2679253]

Making a custom field , which computes its value in value code and returns a json array.

In value code, sql query returns a result which is json encoded !

it works properly , result is returned correctly in the preview but not when the end-point is called !

Expected Result:-

[
  {
    "Nid": "32",
    "PHP": "[{"dish1_like":"0","dish2_like":"0","dish3_like":"3","dish4_like":"0","dish5_like":"3","dish1_dislike":"4","dish2_dislike":"4","dish3_dislike":"0","dish4_dislike":"2","dish5_dislike":"1"}]"
  }]

Result returned :-

[
  {
    "Nid": "32",
    "PHP": "[{&quot;dish1_like&quot;:&quot;0&quot;,&quot;dish2_like&quot;:&quot;0&quot;,&quot;dish3_like&quot;:&quot;3&quot;,&quot;dish4_like&quot;:&quot;0&quot;,&quot;dish5_like&quot;:&quot;3&quot;,&quot;dish1_dislike&quot;:&quot;4&quot;,&quot;dish2_dislike&quot;:&quot;4&quot;,&quot;dish3_dislike&quot;:&quot;0&quot;,&quot;dish4_dislike&quot;:&quot;2&quot;,&quot;dish5_dislike&quot;:&quot;1&quot;}]"
  }]

the php property is returned by value code !

it reutrns &quote; instead of actual " .