Call service from Alert

I’d like to make an Alert that plays a message on my smart speaker. Is that possible? The way I play messages from Automations is by using Call service → RESTful Command as action, but that doesn’t seem to be an option when using an Alert?

The Alert integration is really well documented. With which configuration step do you have problems?

You can do a workaround by setting up an Alert using an empty notifier and automation based on an Event trigger

I just saw that I can turn an HTTP call into a notifier with the RESTful Notifications integration. I should then be able to use the notifier in an Alert.