So, I seem to have figured this out.
When mapping to a data model in the Splunk TA Builder, the tags for CIM data model are automatically assigned to the event types that I define. So in this case, report and vulnerability were assigned to the event types that I had to define for the data.
Also, if I had to, I could separately create more tags within the new Add-on by going to Tags option within the Splunk Web UI settings, selecting my add-on in the List tags by name and creating a new tag for the app. This creates the tag within the add-on itself.
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