I take it you are using the nice funnel chart extension.
I don't think you can show the relative measure in this chart as it can support only one dimension and one measure.
What I would recommend is you use a separate KPI Visualisation to show your conversion rate as a % you could set a target against it and have it go green or red dependent on achievement.
Hope this helps
Probably You are right and it can't be visualized on the same chart but question still remains how to create a measure in Qlik Sense?
I tried to use such expression when creating measure if(wildmatch([Funnel Step],'carconfigurator'),sum([Funnel Amount])) / if(wildmatch([Funnel Step],'CC Visits'),sum([Funnel Amount])) This doesn't work. Is it even possible to sum values in one column depending on values in another? It seems so basic to me and sumif does it in Excel. How can it be done in Sense, in particular how to create measure in such way?