When an HA notification provider targets a notify service (e.g.
notify.mobile_app_myphone), a new optional Data (JSON) field is
forwarded as the service call's nested "data" object - the same
place HA automations put mobile push options like priority, ttl,
channel, and group. ttl: 0 + priority: high make Android pushes
arrive immediately; channel gives printer alerts their own sound.
JSON rather than key=value lines so numbers stay numbers and nested
options work. Validated on both ends: the UI rejects malformed JSON
before saving, and the sender fails loudly instead of posting a
half-built payload. Only included when configured - the default
persistent_notification.create path is unchanged, as its schema
rejects unknown keys.
maziggy
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