Apecx Chart Border not working properly with stacked bar graph

i have build stacked bar graph using apexcharts

i'm trying to add borders at the top of each bar but either it's applied to each stack or just on one data set of the stack

so in the first try , i did this borderRadius : 6, borderRadiusWhenStacked : 'last',



in the second try i did this borderRadius : 6, borderRadiusWhenStacked : 'last',



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