Customize email based on Customer Data

In the Plugin Settings, we added a new field 'Are you a new Customer?'.

We want to add a new section in the confirmation email for new customers.

Assuming the field is FIELD_AREYOUANEWCUSTOMER [setup as a checkbox], can you please tell me how to add a new section in the email

<div class="specialMessage">You are a new customer and need to fill out special forms by ....</div>

This section should only show in the email if the checkbox is selected.