Is it possible to declare variables/namespace/context for the whole template sensor

Configuration
1

I have a quite complicated sensor that evaluates the same value a few times. Something like this:

- platform: template
  sensors:
    rads_call_for_heat:
      friendly_name: "Radiators Call for Heat"
      icon_template: mdi:radiator
      value_template: >
        {% from 'macros.jinja' import
            is_devs_calling_for_heat_by_label,
            is_timers_active_by_label
        %}
        {{
          is_timers_active_by_label('Heating Timers') | bool or
          is_devs_calling_for_heat_by_label("TRV") | bool          
        }}
      attribute_templates:
        active_devices: >
          {% from 'macros.jinja' import
              devs_calling_for_heat_by_label,
              timers_active_by_label
          %}
          {% set timers = timers_active_by_label('Heating Timers').split(',') %}
          {% set trvs = devs_calling_for_heat_by_label('TRV').split(',') %}
          {% set all_aux = trvs + timers %}
          {% set all  = all_aux | reject("==", '') | list %}
          {{ all }}
        active_places: >
          {% from 'macros.jinja' import
              devs_calling_for_heat_by_label,
              timers_active_by_label
          %}
          {% set timers = timers_active_by_label('Heating Timers').split(',') %}
          {% set trvs = devs_calling_for_heat_by_label('TRV').split(',') %}
          {% set all_aux = trvs + timers %}
          {% set all  = all_aux | reject("==", '') | list %}
          {{ all | map('area_name') | list }}

As you can see, both attributes have a very similar code, only changing the final value.

I’d love to reuse that code better. I wonder if is there a way to declare variables/namespace so it would be shared through the whole sensor context.

Something like this would be awesome:

- platform: template
  sensors:
    rads_call_for_heat:
      friendly_name: "Radiators Call for Heat"
      icon_template: mdi:radiator
      namespace:
        {% set ns = namespace(all=[]) -%}
        {% from 'macros.jinja' import
             devs_calling_for_heat_by_label,
             timers_active_by_label
        %}
        {% set timers = timers_active_by_label('Heating Timers').split(',') %}
        {% set trvs = devs_calling_for_heat_by_label('TRV').split(',') %}
        {% set all_aux = trvs + timers %}
        {% set ns.all  = all_aux | reject("==", '') | list %}
        {{ ns }}
      value_template: "{{ ns.all | count > 0 }}"
      attribute_templates:
        active_devices: "{{ ns.all }}"
        active_places:  "{{ ns.all | map('area_name') | list }}"

Is it possible or feasible?

Thanks a lot!