Predefine Reference in graph

[#1]

Hello all,

I want to do something simple I think. In a graph, you can 'Set Reference', but I want to set the reference with an expression. Now I have 2 graphs, but I want them combined.

What do I show in the graph (Expression) ? count( if(Park='PDP', Park)

What do I want for Reference ? count({1} if(Park='PDP', Park)

There are 4 expressions (Park='PDP', 'PIH', 'PSC' and 'PIC'), so 4 references also.

Image 2 graphs :

Greetings,

Jochen