Customize graphs in canvas

Hi , i'm wondering if i can add some changes in my graph's y-axis before being displayed ( i want to set a subtraction ( 100 - value Y) how is that possible? . Another thing i want to skip the "NULL" how can i delete it from my graph

thank you !

@Catherine_Liu can we please get some help here? I expect we need to use expression language and make some changes?


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