AuthorizationRequest Rest Api Add parameter

hi evry one , i hope that all of you are fine and this is my first post in this forum.
however , i use Rest api to get a token and i want to add some other parameters in the body of request.
so my question is: can i add some spécifique attribute(called key in postman) such as “grant_type” ,“username”,“password”,“client-id”?
this is a screenshot of my rest api.