axisLabel (string): the text you want displayed as the label axisLabelPadding (int): padding, in pixels, between the tick labels and the axis label (default: 2) By default, if supported, ...

I'm using the latest version of plotly and it doesn't seem to be resolved since 4 years ago. For some reason, when adding secondary y-axis, the margin calculation seems to ignore the second y-axis, ...