Cost Management supports cloud and OpenShift cost models based on a wizard, which amount to a predefined formula that will be filled with whatever values users enter in the fields they are allowed to edit.

On the other hand, many users are creating/augmenting cost models in a spreadsheet or BI tool by writing their own completely free formulas and distributing values they get from the Cost Management API. E. g. in such a freeform cost model, I as a user would be able to say:

project_cost = 100 + cpu_usage*sum(cluster_cost for find_clusters_by_project(projectId))

I. e. Excel-like formulas.

As an example, WebSheets provides a spreadsheet engine that we could use if we would want to implement this kind of cost-model computation on the browser-side (which is NOT what we want):

https://github.com/WebSheets