The JPO has released the "JPO Status Report".
The purpose of the report is to promptly inform the public of the JPO's statistical information and the results of its measures. The report is written in both Japanese and English so that it can be used as a tool for disseminating information overseas. The report can be viewed on this web page.
Japan Patent Office:
https://www.jpo.go.jp/e/resources/report/statusreport/2023/index.html