Grafana heatmap

Hello, just a quick question because I cannot find a solution yet.

Can bins on a heatmap count another value, compared with x/y values?
What I mean. You have the following data,

x (time) y bin value
20211007 13:12:00 1 23
20211007 13:13:00 2 31


so in the end I want the graph to show x-y and bin value = the heatmap value.


how are we subtracting a number from a timestamp?