Hi Vladimir,
Greetings from Syncfusion Support.
We checked with your required scenario and “Provide CellRendering event in HeatMap component” has already been considered as a feature request from our end. The required customization can be achieved by using CellRendering event once this feature is implemented.
Generally, we will plan the feature implementation based on customer request count, feature rank and wishlist plan.
Please track the below feedback link to know the status of the feature.
We appreciate your patience.
Regards,
Sharon Sanchez S.