Fixed it with some help from New Aqara Human Presence Sensor FP1 - #291 by liviu
template:
# up to 9 separate regions
- trigger:
- platform: template
value_template: "{{ states('sensor.living_room_radar_action').split('_')[1] == \"1\" }}"
sensor:
- name: fp1_z1
state: >
{{ trigger.to_state.state.split('_')[-1] }}