add @formula to work with categories

It would be very helpful, if we can work with categories in a view. For excample: customize the category colour, some additional values and so on.

And it would be very nice, if we can get the category item to work with, like @GetColumnCategories("columnname") to get a list of all categories in this specific column.

Or @GetCategory("categoryname") or equivalent.

In my example, i have several multi value fields and i want to display there specific values in specific categories. But it isnt possible. The only thing i can do is, to show everythin in one column. But with that, you cant use the full potential of a view like "order column", "show it in a tidy manner". So we need more control over a view.

Or calculate some values and add them to the category: @AddToCategory("columnname", "categoryname", value)

I think, this feature is very important.

This idea could be merged into this too: https://domino-ideas.hcltechsw.com/ideas/NTS-I-46