Watcher by customer

I want to send an email to 5 customers in a single email but without making 5 watchers, only with one, and each customer receives their individual information, since in the future I will have 100 customers and modifying each one would take a long time. Do you think it is possible to do this?

The email key can have a comma-separated list of email addresses in an array something like this;

"email": {

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