This response is based on information you provided and is not to be used when making a decision. Read the regulations, consult with your chain of command, JAG and/or IG before making any decisions.
AR 623-3 is clear on this issue. The rater prepares the report and the rated Soldier will not prepare their own report. See extracts below:
(3) End of the rating period. The rater will review the final DA Form 2166–9–1A when preparing NCOERs. Afterwards, they will initial and date the form to acknowledge the review. The rater will include the duty description from the rated NCO’s final DA Form 2166–9-1As and may include performance-related information. However, the choice of what to enter on the NCOER is ultimately up to the rater.