Context with specific data

Hello, I'm trying to set the context of my feed which has this structure :

[
  {
    "Id": 1817,
    "Type": 10,
  },
  {
    "Id": 1819,
    "Type": 20,
  }
]

I want to get only elements with Type value is 20, so I've set context like this : $.[?(@.Type == 20)]
This command produce an error 500. Isn't it the correct syntax to do that?
Thanks !