The team is looking into this feature and considering solutions. We will update when there is more information to share.
An error occurred while saving the commentAnonymous commented
I'm commenting on Jamie's stretch goal. Companies like mine who utilize standardized Custom Dictionaries, Autocorrect, etc. to start with for all our employees absolutely require a single location where each those various files are stored (e.g. %APPDATA%\Microsoft\Office for Autocorrect and %APPDATA%\Microsoft\UProof for custom dictionaries) that both Teams and Office 365 Pro Plus/Office 2016 apps use. Without that, my fear is we'll get a lot of help desk calls when a user adds a new Autocorrect entry in Teams or in the other Office apps, but it doesn't work on the other side. I can't imagine anyone wanting to add a new word to a custom dictionary in Teams and then having to add it again in Word, PowerPoint, etc.