I have previously used a custom config for the sensor from TillFleisch.
I was looking at the docs in esp home for the sensor and I can see it supports 3 zones and it appears in the documentation that you should be able to customise the size of the zone but after a few hours of various failures I thought I would ask if anyone has a code snippet of what it should look like. I believe it should be possible as the docos from LD2450 Sensor — ESPHome under Number seem to suggest it.
Nevermind. Less looking in the YAML and more looking in the interface.