No, you cannot.
However, you can check the number of comments by exporting the manual list.
Export manual list (Web Browser)
Also, you can export a list of comments posted using the rating feature.
If you want to collect feedback on manuals, use the rating feature.
▼Setting Up Manual Evaluation Feature (Web Browser Version)
https://teachme.jp/8/manuals/42393853
▼Export and Review Manual Evaluations as CSV (Web Browser Version)
https://teachme.jp/8/manuals/42394796
Related: What happens if I add a comment to a manual or step?