Feature Request: Render Table of Contents for markdown in Issue Comments
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Problem to solve
Today, we can use table of content [[_TOC_]] markdown tag in issues and merge requests, but we cannot add one to notes or comments.
This makes it harder to navigate through long comments on issues.
It is counter-intuitive to have different markdown support in issues and issue comments and displays a different behavior.
For example, [[_TOC_]] tag renders a Table of Content in the issue but shows italic TOC instead of rendering the Table of Contents.

Proposal
We should also render [[_TOC_]] tag in Issue comments. Ideally, it would be great if we can add full support of GitLab-Flavored Markdown in issue comments to standardize the user experience using markdown in GitLab.
Intended users
and other users who write long issue comments.
User experience goal
Some Customers use issues for task management, and put task details in the description fields and uses issue comments as task log, which could span across several days, with multiple H2 headings. In this case, a ToC in the comments could really help to jump around between headings.
Current workaround
Currently, they are using a local Markdown editor that supports automatic table of content generation (e.g. Typora, Obsidian, VSCode) to write the draft, before copying to the issue comment box.
Further details
This feature request was first reported as a bug #239303 (closed)
Feature request proposed by Premium Customer via Internal Ticket. All GitLab team members can view the ticket on Zendesk.