Azure devops extension- Custom extension point

What should i target in the manifest file in order to display my extension in the same level than Azure Boards-Repos-Pipeline etc...

I was able to display it under all existing hubs but when it comes to new ones i'm not able to find anything in Microsoft documentation https://learn.microsoft.com/en-us/azure/devops/extend/get-started/node?toc=%2Fazure%2Fdevops%2Fmarketplace-extensibility%2Ftoc.json&view=azure-devops

Currently, it is not supported to add a custom hub to the top-level that is same as the hub groups (such as Boards, Repos, Pipelines, etc..) in the menu bar of project. You can only add child hubs under the top-level hub groups.

If the custom hub you want to add does not belong to any of the services (Boards, Repos, Pipelines, Test Plans and Artifacts), as a workaround, you can add it as a child hub under Overview.

The Overview also is a top-level hub group in the menu bar of project. Every time when opening a project from the home page of organization, by default, it will expand Overview and open the child hub Summary.

To add a custom hub under Overview, in the vss-extension.json file, you need to set the 'targets' of this custom hub to be 'ms.vss-web.home-hub-group'.

See below example:

• Menu bar of project.

  

• The vss-extension.json file. More details, see here.

  

If you really need the feature to add a custom hub or hub group to the top-level in the menu bar of project, I recommend you try to report a feature request on Developer Community. This will make it more convenient for the product teams to receive and understand your ideas. And your feedback also could be helpful for improving the Azure DevOps products.

EDIT:

Here I find the documentation (Add a hub group) to add a custom hub group to the top-level in the menu bar, and also add a custom hub to the custom hub group.

For your case, another workaround is you can add a custom hub group to the project menu bar, then add the custom hub to it.