Hello 
I have been trying to find the answer for a long time.
When I send the app design to the developer.
The encoded app has a different font size than in the project.
For example:
The project in Figma has a FONT size of 16 PX, after export to zeplin, the IOS developer has 16 PT.
When I do a screen of the app and it compares with the project. The size of the font on both is different.
THX.