Configure your notification to identify recipients by module data and page context.
You'll need a module that has a line item formatted as Type List, with List set to Users. Your model builder can configure the line item to take its value directly from the list, or evaluate it with a formula.
You can still design and preview the notification if the line items are not yet populated in the module. On your published page, users can only submit the notification if the recipients are defined. For your notification action to be useful, populate the line item values for the contexts you expect your users to select.
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