dimension Fractions

I know people in the metric (most of) world are going to be like "huh?" but I'm trying to match a convention to build a part description parametrically… I was hoping Pascoe's "variable to string" FS would do it but it doesn't include that function, which tells me it's not super trivial so I thought I would ask if anyone…

I want to have all my measurements in Feet, inches and fractions of inches. How can I accomplish this?