How to use an helper value in Alarm control panel

Hi, I would like to use template in my manual Alarm Control Panel configuration to get value of some helpers to set arming_time, delay_time and trigger_time so I can set them on my lovelace Alarm dasboard like here:


so I tried with different type of helpers (number, text, time) but nothing works at this time. Here is the error I get:

I also tried different templates with no success:

arming_time: {{ states('input_text.delai_activation_alarme') }}
arming_time: {{ states('input_number.delai_activation_alarme') }}
arming_time: {{ states('input_number.delai_activation_alarme') | int }}
arming_time: {{ strptime(states('input_number.delai_activation_alarme'), '%HH:%MM:%SS' }}

Don’t know if possible to use template here, any idea please?