API Gateway JWT Token authentication

[Princy]

Instead of Apikey I want to add security based on JWT token authentication.

securityDefinitions:

  jwtAuth:

    authorizationUrl: ""

    flow: "implicit"

    type: "oauth2"

    x-google-issuer: "https://securetoken.google.com/PROJECT-ID"

    x-google-jwks_uri: "uri"

    x-google-audiences: "PROJECT-ID"

and in the path with
  -jwtAuth: []

In the request I have to send Authorization: Bearer {token} instead of that I want to add it in idtoken parameter in the header.

How to achieve that?