Zend certified PHP/Magento developer

Does MS Edge support multi-account containers across tabs?

My company’s web app maintains sessions via cookies. One of our customers uses MS Edge and wants to be able to have a completely separate session running our web app in each browser tab, for sometimes 2 but up to 3 tabs and 3 separate sessions.

Getting 2 different sessions is pretty easy by using 1 normal Edge window + 1 private/incognito window. The 2 sessions are separate and that’s what they want. But what if they want 3 tabs and 3 sessions? My understanding is that when you’re in the private/incognito space, ALL private/incognito tabs will share the same cookies and thus the same session. Is my understanding correct? And if so, is there any way to force different cookies (and thus different sessions) on a per-tab basis in Edge?

Apparently Firefox has a way to achieve this (Firefox Multi-Account Containers) so I’m wondering if Edge may have something similar.