How can i use requestBody to upload an image as binary in phoenix/Elixir

So far i have been using

    swagger_path :create_tag do
    post "/tag"
    produces "application/json"
    description "register Tags"
    consumes "multipart/form-data"        
    parameters do 
    image :formData, :file,  "The file to upload.", required: true
    end
    response 200, "Success"
end

However i would like to use requestBody to get the binary data of the image, with above i am getting the image path, and have to work on Plug.Upload in controller.

would like to know the syntax using the requestBody of swagger in phoenix