As of API 43 there seems to have been some rest resources added to the metadata api. This Documentation Seems to be lacking the ability to tell me how they want me to send the zip package with the JSON request object. Any information would be helpful, Thanks in advance!
Use a multi-part form... Had to scour the source code for the CLI to find this out ..
Content-Disposition: form-data; name="entity_content"; Content-Type: application/json
Content-Type: application/zip Content-Disposition: form-data; name="file";
Zip binary data goes here.