Stack Notifications

I have two phones (personal and work) and my work phone has an email app (Nine) that displays multiple emails in my notifications area. On my work phone, it shows one notification that can be expanded and contracted. On my personal phone, Join shows each email as an individual notification which clutters up my phone (and browsers) with notifications. It would be nice if Join stacked notifications like they are on the native device, and made them expandable/contractible.