Thanks for submitting this question for the REST API calls for abuse reporting. Since this falls under development and is outside the immediate scope of Jive Customer Support, I'm moving this discussion to the Jive Developers space for attention from the greater development community. In the future, feel free to post development related questions directly there.
I would recommend checking out Re: Is there a way to report messages within a discussion as abusive via REST API and also Jive REST API v3.13 → AbuseReport entity
(On Prem 7.0.2)