Operations between virtual values

When I create virtual values ​​in the Virtual section, I cannot then create other virtual values ​​that derive from arithmetic operations or functions between the previously created virtual values.

Yes, there is such a limitation for virtual values, sorry.

You can try to make a complex virtual value with all the necessary arithmetic operations at once.
Look in the settings of the virtual value, in addition to choosing the device parameter, you can create functions f(x)