The NavigationBar component already supports several extension points.

navigationBarLeftContributionExtensionPoint (resp. navigationBarRightContributionExtensionPoint), but elements added to this are "packed" to the left side (resp. right side) of the header.

editProjectNavbarSubtitleExtensionPoint (used only in EditProjectNavbar) adds support for a subtitle displayed below the project name:

There is no way to add elements around the project name at the center, to replace it or add some context (for example to be used in custom ProjectContextMenuItem elements).

It should be possible to support all of these use cases, and more, by adding a single extension point around the <div>{children}</div> part of NavigationBar.