open sample https://www.infragistics.com/webcomponents-demos/samples/grids/data-grid/type-heatmap-table notice that Grid Heatmap does not fill grid cells with colored background <img width="1278" height="510" alt="Image" src="https://github.com/user-attachments/assets/48a7a5d6-ac47-4599-b456-e23e027ba861" />
open sample https://www.infragistics.com/webcomponents-demos/samples/grids/data-grid/type-heatmap-table
notice that Grid Heatmap does not fill grid cells with colored background