Skuid charts popup invocation: pass split value to to model for popup


Coming back to skuid charts again. We have a requirement to display opportunity count for account based on month and split by year. problem is when a user clicks on any bar, i am able to pass on the month value ({{$}}). however, the year value which is split type is not passed on to popup. thereby causing a problem. i looked at highchart documentation as well but couldn’t find any solution for it. is there any property that i have missed which can provide value of split field?