The Microsoft Teams mobile clients (iOS, iPad and Android) have, for some time, allowed users to create contextual replies by adding the original post as part of the reply.
This feature is now available for Desktop versions of Microsoft Teams and should roll into the web version in due course.
To use the feature, click on the elipsis for the comment that you wish to reply to and select reply …
When you click reply, the original message appears in a quoted format …