Example using response from a script?

Configuration
13

Following on from this solution, I have a script:

alias: Daily Summary Script
variables:
  my_message: >
    Today, Phil walked {{ states('sensor.galaxy_watch_daily_distance',
    with_unit=True) }} in {{ states('sensor.galaxy_watch_daily_steps') |
    int(0) }} steps.
  result: |
    {{ {'value': my_message } }}
sequence:
  - stop: End
    response_variable: result
description: ""

And an Automation that uses it:

alias: Daily Summary  Notification
description: ""
triggers:
  - at: "21:00:00"
    trigger: time
conditions: []
actions:
  - action: script.daily_summary_script
    metadata: {}
    data: {}
    response_variable: result
  - metadata: {}
    data:
      title: Phils Daily Activity Summary for {{ states('sensor.date') }}
      message: "{{ result.value }}"
    action: notify.mobile_app_phils_phone

This works, but I can’t get the string into a single variable - note the nested {{ in the script variables my_message and result - is there a simpler solution?