We are building a unified portal to view our databases and almost all other managed cloud providers like AWS provide instance level/node level view of clusters.
Currently, there's no way for me to get instance level/node level inventory details.

Also, when billing/cost is generated, it's generated on a cluster-level basis. Since we now have separate sizing for Analytical nodes and Electable nodes, it's better to separate out the cost to be at an instance level.

Again, all cloud providers like AWS do give us instance-level costing for EC2/RDS so I don't see why that can't be technically possible.
Support costs should also come at node level and then added cumulatively since all projects are charged with the same support subscription and cost.