Hi,
Welcome to the community!
SonarCloud doesn’t have any “report” formats other than the UI, which we believe is the best way of consuming this data. Nonetheless, you’re welcome to use the Web API to pull the data on your project and construct your own reporting.
The best way to master the API is to perform the desired action via the UI and eavesdrop to see which calls the UI made to accomplish the action.
You may also find this guide helpful.
As a side note, you may also be interested to know that SonarQube Enterprise Edition($$) includes reporting.
HTH,
Ann