Thanks for all your ideas and input. Dimensions in the ways you described are not supported yet, but we will make our best to support it in some ways as soon as possible. 
However with the coming dxf/dwg export the coming weeks, all the locked Shapr3D annotations will be included in the file and can be viewed/printed with any dwg/dxf reader on the iPad.
You can subscribe for a beta here: Upcoming DXF import / export feature - looking for use cases