PowerApps Sharepoint Listforms: Populating PeoplePicker

Hi,

 

 

I have created a list on a sharepoint online site and customized the forms using powerapps. There is a manager field that i want to populate automatically in powerapps. The manager field used in this list would get its value of the current user's manager from another list that has the

User->Manager mapping information.

 

How can i achieve this?

 

Please advice...