Hi,
We appreciate you reaching out to us!
In our documentation, you can find a property that allows you to change markers to a basic shape:
https://api.highcharts.com/highcharts/p ... ker.symbol
But, if you want to customize markers even more, you can stick to
translate method you mentioned above here:
`
H.seriesTypes.heatmap.prototype.translate`
Demo:
https://jsfiddle.net/BlackLabel/jv1ek30r
Let me know if you have any further questions.
Best regards!