Specify timestamp field from MQTT datasource as x-axis in time series plot

Grafana Time Series Panel
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Grafana version = 10.1.2
Operating system = Windows 11

I have an MQTT data source where each measurement contains a data sample (float) and a timestamp integer (unix_ms) called “t_measurement”

A time field, called “Time”, is automatically appended to each record received by the MQTT datasource - set to the time the data was received by Grafana.

If I then plot the data in a time series graph, the x-axis uses the automated “Time” field.

How can I change the plot so that “t_measurement” is used for the x-axis instead of “Time”?

Thanks,
Dave