You can make these edits using a cmdlet, please see the documentation at https://docs.microsoft.com/en-us/powershell/module/exchange/users-and-groups/Set-UnifiedGroup?view=exchange-ps
This should help you make the edits requested in this topic.
The engineering team is continuing to work on adding support for multiple accounts on desktop clients. We will first launch support for 1 work/school account and 1 personal account so users can enjoy Teams for work and personal side-by-side. Windows and MacOS. Support for multiple work accounts is still being worked on and will come at a later date.
You can track status via the roadmap here: https://www.microsoft.com/microsoft-365/roadmap?searchterms=68845.
This item remains on the backlog.
Thank you for your feedback. The team is currently planning for this work, we will share an update as soon as one is available.