Community Advocate from GitLab here! If I understand you correctly, you are looking for a way to aggregate analytics across GitLab, so that users can view information across multiple projects and groups in one place.
We have the Analytics feature designed for that [1]. Please be aware of the distinction between Group-level and Project-level analytics described there.
If you have any feedback on how we can improve this feature, or if you have other ideas, please open an issue [2] and share as many details and examples as possible. We'd love to look into it!