OAuth 2.0 - Change content type to application/json

My question:
Is it possible to change the OAuth 2.0 content request type from “application/x-www-form-urlencoded” to “application/json”? This is because the service I am calling only supports request in a body using JSON.

Details (like screenshots):


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This post might be of interest to anyone looking for an alternative solution as Postman doesn’t support automatic customization of this header key through the “Get New Access Token” view