Custom tooltip for extended trace

I am using heat map. whenever mouse hover the chart showing tooltip. But Labels are showing x, y,z.
I need to show labels like Time instead of x. Latency instead of Y. In y value i need to show 20000 instead of 20K.

Using this hoverinfo i modified. But i am streaming the data using extendTraces. For new data how to add hoverinfo.
pl let me know.

Pl chk the below link

To do so, you’ll have to include your custom hover in the trace text array, see example here:

You might want to subscribe to which when implemented should make it a little easier to do.