How to upload groovy script to Nexus3 and run that script properly?

Question

I want to upload a groovy script to my nexus instance and then I want to run that script.

I have this json.

{
  "name": "groovy",
  "type": "groovy",
  "content": "groovy.groovy"
}

Then I use the upload, list and run API-s.

# upload 
curl -v -X POST -u admin:admin --header "Content-Type: application/json" 'http://localhost:8081/service/rest/v1/script' -d @groovy.json

# list
curl -v -X GET -u admin:admin 'http://localhost:8081/service/rest/v1/script'

# run
curl -v -X POST -u admin:admin --header "Content-Type: text/plain" 'http://localhost:8081/service/rest/v1/script/groovy/run'

I suspect this there is a problem with the json's content type.

My other json which is working is look like this:

{
    "name": "maven",
    "type": "groovy",
    "content": "repository.createMavenHosted('myMavenRepo')"
}

There is a reference guide for this json somewhere?

UPDATE:

I checked the public Nexus repository here.

Then here I found the scripts interface.

name: 'security', type: 'org.sonatype.nexus.security.internal.SecurityApiImpl' link

name: 'core', type: 'org.sonatype.nexus.internal.provisioning.CoreApiImpl' link

name: 'repository', type: 'org.sonatype.nexus.script.plugin.internal.provisioning.RepositoryApiImpl' link

name: 'blobStore', type: 'org.sonatype.nexus.internal.provisioning.BlobStoreApiImpl' link

But I still not found the way to upload and use a groovy script properly.