Convert multipart mixed to finch command

gistfile1.txt

curl -v --location --request POST "https://route.example.com/route/v2/send" --header 'Content-Type: multipart/mixed; boundary=mimeboundary' --header 'Authorization: Basic AUTH_TOKEN'  --data-binary "@body_data.txt"


body_data.txt is:

--mimeboundary
Content-Type: application/json
Content-Id: main

{
   "type": "DUDE",
   "source": "jane@doe.com",
   "destination": "john@doe.com",
   "config": "configvalue",
   "subject": "Example Email",
   "operatordId": 200  }
--mimeboundary
Content-Type: application/vnd.example.remoteContent
Content-Id: EMAIL-Demo.mp4

https://example.com/resources/EMAIL-DEMO.mp4
--mimeboundary
Content-Type: text/plain; charset=utf-8
Content-Id: example.txt

This is my text.
--mimeboundary--