Heatmap text example

Author: LiamConnors

doc/python/heatmaps.md

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   plotly:
     description: How to make Heatmaps in Python with Plotly.
     display_as: scientific
@@ -197,6 +197,25 @@ fig.update_layout(
 fig.show()
 ```
 
+### Text on Heatmap Points
+
+
+In this example we add text to heatmap points. We use the values from the `text` attribute for the text.
+
+```python
+import plotly.graph_objects as go
+from plotly import data
+
+df = data.tips()
+
+fig = go.Figure(go.Histogram2d(
+        x=df.total_bill,
+        y=df.tip,
+        texttemplate= "%{z}"
+    ))
+fig.show()
+```
+
 ### Heatmap and datashader
 
 Arrays of rasterized values build by datashader can be visualized using