It's likely simple to create the scoop rake task like this and the manifest template like this.
But I'm not sure how scoop and its shim scheme supports uru's two required wrapper scripts uru.bat and uru.ps1 that need to be generated at install time similar to the install script and uninstall script.
cd to where you downloaded the above uru.json (also attached), run scoop install uru, and use uru as normal.
Anyone interested in seeing scoop and uru play well together, smoke test the prototype and report back with results. If all looks well, I'll add scoop build automation similar to chocolatey, upload the uru.json manifest to the downloads page, and create a new wiki page with usage details.