You can customize the cell by using the cellSettings property.
Change the width, color, and radius of the heat map cells by using the border property.
Enable or disable the cell highlighting while hover over the heat map cells by using the enableCellHighlighting property.
Note: The cell highlighting only works in a SVG rendering mode.
Set the margin for the heat map from its container by using the margin property.
The title is used to provide a quick information about the data plotted in heat map. The text property is used to set the title for heat map. You can also customize text style of a title by using the textStyle property.
You can toggle the visibility of data labels by using the showLabel property. By default, the data label will be visible.
You can customize the font family, font size, and color of the data label by using the textStyle in the cellSettings property.
You can change the format of the data label, such as currency, decimal, percent etc. by using format property.
In the HeatMap, you can customize the cell value using the cellRender client-side event.