Dear Grace Adeoshun,
Greetings! Thank you for posting in Microsoft Community.
May I know if you want to upload an existing list of Project tasks to the Tasks App in Teams?
If yes, I'm sorry and I'm afraid there is no built-in feature to meet this requirement. Very sorry for the inconvenience.
I agree with you that this is a feature to considered. I sincerely recommend sending your valuable feedback toTeams Feedback Community. Our Product Team is in-charge of the site and they are constantly checking the comments and feedback from our customers. Many features have been developed and improved based on users' comment.
If my understanding of the scenario is not consistent with yours, feel free to point it out.
Thank you for your cooperation and understanding!
Have a nice day!
Sincerely,
Tina | Microsoft Community Moderator