One of my customers recently came up with a requirement, where my customer wanted to get the People Picker Option while working with the Project Entity custom field using Project Online.
Based on my experience, it required a great amount of effort in order to customize the custom field to achieve this requirement. In addition, my customers have always configured it in Project Server on-premises product and not in Project Online application.
After doing a lot of research to achieve this requirement to configure People Picker for the Project Entity Custom Field, I learned that it can be done fairly easily using Project Details Pages and using a small Java Script.
Thanks to Laksh for sharing this information.
Steps to achieve the requirement
Below TechNet Gallery has the steps by step information, which is prepared and shared by James.
I hope this information helps you configuring People Picker in Project Online/Server easily.