Applying Formula to Label or between Project Parameters

[Anonymous]

Hello. I'm a Revit user in S.Korea.

I'm now making a new room tag family (Family Category : "Room Tag" from generic annotations template)

And the problem can be explained with the image below:

There's no problem making a label/parameter "pyung",

but there is a problem applying the formula "Pyung = Area / 3.3"

I couldn't find a way to apply the formula at Family Types Window.

I have also thought for another solution,

: Make shared parameter "Pyung" in Project, and use the parameter as label parameter.

But still, as far as I know, there's no way of applying formula between shared (project) parameters.

Desparately looking for a solution, would be grateful if one give any.

[Alfredo_Medina]

It is possible to add calculated values into schedules, but not into tags.

[keshanis]

Alfredo_Medina -  Is there a plug in or something that allows it to be enterable in a tag specifically?