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.
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.
Nested hubs can use the context menu option 'Search at this location' to narrow the scope of the search.
Microsoft recommends to limit the levels to 3 as stated when enabling a 'Parent hub association'