MacroView DMS and DMS Pro version 9 includes support for Nested hub site structures in SharePoint online.
For more details on hub sites and its features see here.
The HubSites hierarchy will be displayed in the TreeView of MacroView DMS.
Functionality
Hubs at its top level can be filtered using the context menu when selecting the parent hub node.
Filtering can also be done at the child hub levels.
Search
Nested hubs can use the context menu option 'Search at this location' to narrow the scope of the search.
Notes
Microsoft recommends to limit the levels to 3 as stated when enabling a 'Parent hub association'