Aug 15 2019 07:33 AM
Aug 15 2019 08:09 AM - edited Aug 15 2019 08:10 AM
You cannot from within Teams itself by starting a new chat. However you have an option of deep linking. So you can basically create a group chat with those 4 people, name it, and even start a message to it all form a single URL. You would have to publish this somewhere in a Team annoucement, e-mail, news article etc. Then people can use it to start the chat. Once started, they will then have it in their chat list to favorite/pin.
More about how to do that here: https://docs.microsoft.com/en-us/microsoftteams/platform/concepts/deep-links#deep-linking-to-a-chat