yAxis property
        
        dynamic
        yAxis
        
      
getter/setter pair
      When using dual or multiple y axes, this number defines which yAxis the particular series is connected to. It refers to either the axis id or the index of the axis in the yAxis array, with 0 being the first.
API Docs: https://api.highcharts.com/highcharts/series.tilemap.yAxis
Implementation
dynamic yAxis;