How to add mass of part into drawing, but not in grams like part.

I have a part. This part is designed in metric system, weight unit is gram.

I set custom property of part,  Weight --> SW-Mass@Second_roll.SLDPRT --> 8027g.

How to set second property with for example pounds (can I add equation to properties?), without changes of units in document?

Or how to add note with weight in pounds?

SolidworksDrawings And Detailing