Setting Blendspace Axis Values in Animation Blueprint

How do I set blendspace axis values in animation blueprint ? Specifically I am trying to set the Maximum Horizontal / Vertical values of a blendspace in Animation blueprint as I want to tie these max values to the character max velocity. Is this a bad/wrong idea. If yes, is there any alternative ?

P.S.: I am trying to get a reference to a specific blendspace in the animation blueprint, but I only have the “cast to blendspace” node, with nothing feeding into the “object” input.