In Umbraco 7 I could do:

GetNode("2", "myNode", "My node name", "Cats", "Favourite")

where the 4th parameter was controller name and the 5th - action name

In Umbraco 10 I am trying to add a custom route in TreeController:

string routePath = $"umbraco/backoffice/Cats/{rootNode.Id}";
var node = CreateTreeNode(rootNode.Id, parentId, queryStrings, rootNode.Title, rootNode.Icon, rootNode.HasChildren, routePath);

but it still seems to be trying to fetch html angularjs view - in this case:

views/backoffice/cats.html

The documentation does not say anything about it: https://docs.umbraco.com/v/10.x-lts/umbraco-cms/extending/section-trees/trees

Is there a way to route custom section tree nodes via MVC pattern controller/ action or I really need to use angularjs in order to display my section views?