Comments in SharePoint lists

SebastianSzyroki This is a SharePoint default behavior of list commenting.

Whenever you mention any user in the comments section, they will receive an email notification on outlook.

Unfortunately, you cannot change this behavior to send notification to Microsoft Teams instead of Outlook. Also, you cannot customize the email notification template/subject.

Read more information about this in below articles:

1. SharePoint Online/Microsoft Lists: @mention people in list comments 
2. SharePoint Online: All you need to know about Commenting in Lists 

Also, can you please share the JSON column formatting you are using for Komentarz column (just curious what JSON is used)?

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