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Comments added to Jira issues can be seen under the 'moRenderJiraComments' LWC. It will be titled Jira Comments and will be displayed as a widget on your Salesforce record page.
This LWC displays the comments from all the Jira issues that are associated with the Salesforce record that you are currently viewing. It also includes the details which gives give the information like comment author, associated Jira issue, etc about the comment.