explain me a list notation in postoverflow

name: crowdsecurity/cdn-whitelist
description: "Whitelist CDN providers"
whitelist:
  reason: "CDN provider"
  expression: 
    - "any(File('cloudflare_ips.txt'), { IpInRange(evt.Overflow.Alert.Source.IP ,#)})"
    - "any(File('cloudflare_ip6s.txt'), { IpInRange(evt.Overflow.Alert.Source.IP ,#)})"
data:
  - source_url: https://www.cloudflare.com/ips-v4
    dest_file: cloudflare_ips.txt
    type: string
  - source_url: https://www.cloudflare.com/ips-v6
    dest_file: cloudflare_ip6s.txt
    type: string