You can't insert a conditional visualization expression in Sense.
For a fast solution you can load some description fields and use it to manage visualization directly in calculate dimensions expressions
ex. if(GetFieldSelections(description field 1)=some text,dimension1,
if(GetFieldSelections(description field 2)=some text,dimension2,
if(GetFieldSelections(description field 3)=some text,dimension3
Alternatively you can check for your Sense visualization api's in QlikBranch Community:
You will certainly find what you are looking for.