Use expand to filter if string is in a group

Configuration
,
1

I’d like to create an automation based on the state attributes generated by MicrosoftCalendar integration.

The automation should be triggered when at least one of the ‘summary’ attributes within the ‘data’ group contains a specific string (in the example below I need to trigger if in ‘data’ I have at least one ‘summary: Sam at home’).

I guess I need to create a template with the group expand function, but I have no idea how to combine it with string search…

Below the state attribute YAML

message: No school!
all_day: true
start_time: "2023-12-08 00:00:00"
end_time: "2023-12-09 00:00:00"
location: ""
description: ""
data:
  - summary: No school!
    start: "2023-12-08"
    end: "2023-12-09"
    all_day: true
    description: ""
    location: ""
    categories: []
    sensitivity: Normal
    show_as: Free
    attendees:
      - email: [email protected]
        type: required
    uid: >-
      AQMkADAwATEx
  - summary: Sam at home
    start: "2023-12-08"
    end: "2023-12-09"
    all_day: true
    description: ""
    location: ""
    categories:
      - HOME
    sensitivity: Normal
    show_as: Free
    attendees: []
    uid: >-
      AQMkADAwATEx
  - summary: Sam at home
    start: "2023-12-09"
    end: "2023-12-11"
    all_day: true
    description: ""
    location: ""
    categories:
      - HOME
    sensitivity: Normal
    show_as: Free
    attendees: []
    uid: >-
      AQMkADAwATEx
color: light_green
hex_color: "#87d28e"
offset_reached: false
friendly_name: Calendar home