Curve from equations missing from the Building Desing Engineer Role

Hi All, I am working on a concept and would really like to use the Law function to create a curve but somehow I can not find this function in any of the apps available. I can set laws for my coordinates with the relevant equations but cannot use them after to build a curve. May be there is there a workaround and why would that not be included into the Role for architects? Perhaps the xGen Design  - would love to hear some ideas about generating curves with a formula.