Most employers have templates for proof of concept activities for both process POCs and product POCs. You may want to trun inward to your employer for their particular template depending upon whether your POC is process or product based to ensure an appropriate level of reporting.
That would be a test report, not a Proof of concept (POC) report. One is for suitability for the new process or tool, the other suitability for the new app in your environment. These reports are very different items.