This does not 100% qualifies as an answer, as i see it as a hack or misuse of a feature of GitLab. But i thought the idea is worth sharing. Additionally it will only work with projects which you can actively change - else this would need interaction of project maintainer.
GitLab supports optional topics on projects, they can be maintained by maintainers within the general settings of a project.
If you add a topic interesting
. they get searchable by this tag like https://gitlab.com/explore/projects?tag=interesting
This way, you can create and maintain a list, which is always up to date and show the most recent description, name, etc. - also in connection with permissions (you will not see something you are not suppose to see).
The downside is, that this topic might not be suitable to be (ab-)used within your group, and it might add more confusion for others than it should, because you will see this topic in the project overview page.
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