Download and unzip the font, for example from

Drag the .ttf (for example Poppins-Bold.ttf) file into your Xcode project, perhaps in a folder called Fonts and ensure that it is included in your project’s target (select it and verify Target Membership in the file properties).

Edit your info.plist and add a top level Fonts provided by application node, and then a child Item 0 node with a value of the name of your font, for example Poppins-Bold.ttf.

Use the font in your app:

    .font(.custom("Poppins-Bold", size: 48))