how to do parametric modeling in SolidWorks drawing?

When in part or assembly one can define new parameters or control the existing one from `tools>equations` But when using the drawing workbench this option does not exist. I am trying to draw something and I need to do it parametrically because there is a relation between two dimensions. I would appreciate if you could help me know where I can access the parameters and define equations etc.

SolidworksDrawings And Detailing