I am trying to orchestrate my Databricks Workflows tasks using a parameter I would set in a notebook.

Given the workflow below I am trying to set a parameter in the Cinderella task which is a python notebook. Once set I would like to use this parameter in the true_false_selection block instead of this 1=1 condition. Something like:

if ${notebook_parameter} == "Rolling" --> execution continues to the isTrue task which is also a python notebook

elif ${notebook_parameter} == "Prophet" --> execution continues to the isNotTrue task which is another python notebook. 

Precisely, I want to use parameter set inside notebook in this menu selection as the pseudo code shows: 

I am aware of both 
dbutils.jobs.taskValues.set(key='selection', value='Rolling')
&& 
dbutils.widgets.text("selection", "Rolling")
but it appears neither can be used in the if/else condition task.