How to Link Test Execution to Test by using "https://xray.cloud.getxray.app/doc/graphql/"

[Praveen Y]

Hi Friends,

I tried to link Test Executions to Tests in JIRA Cloud, by using 

https://xray.cloud.getxray.app/doc/graphql/

By using below schema:

https://xray.cloud.getxray.app/doc/graphql/addteststotestexecution.doc.html

mutation {
    addTestsToTestExecution(
        issueId: "12345",
        testIssueIds: ["54321"]
    ) {
        addedTests
        warning
    }
}

But not clear on this documentation how to implement this schema for cloud. 

Could you please any one can help me to add the test executions tests in JIRA Cloud (https://corelims.atlassian.net/)