The feedreader RSS integration will work fine, but will have a polling interval and therefore a delay.
ChangeDetection uses Apprise notifications, so another option is to configure a notification of type hassio://, see the documentation here (https://github.com/caronc/apprise/wiki/Notify_homeassistant).
It creates a “persistent notification” and therefore an event, which HA can listen for, clear, and then take any action you want via an automation.
Here’s the result of a test notification I sent:
{
"event_type": "call_service",
"data": {
"domain": "persistent_notification",
"service": "create",
"service_data": {
"title": "ChangeDetection Alert",
"message": "Change Detection (Test from changedetection.io!) has changed.",
"notification_id": "65a58b08-e018-43a8-9cb3-e8bbe67caedc"
}
},
"origin": "LOCAL",
"time_fired": "2021-10-25T08:21:56.796650+00:00",
"context": {
"id": "dfa18ddc679245ee11a6954e11a02381",
"parent_id": null,
"user_id": "7804bba3743643119860e6731f0c7082"
}
}
The Apprise engine can also generate IFTTT notification events (see https://github.com/caronc/apprise/wiki/Notify_ifttt). I don’t have an IFTTT webhook server installed in my HA to demonstrate, but it would be trivial to do so.
There’s no need for a formal integration.