In order to use different fonts from the ones present in the Kalipso Designer you will need to download the intended from from any website, there are a lot of them, one example (https://www.1001fonts.com/).
Example for a font named Vampiro One
For the font to appear in the designer you need to install it in the operating system. Open the font and Install it.
In the Designer to use the font you just need to write the name of it in the font input on the object you want to.
In the designer the problem is solved, but in the terminals the font is not installed, so you will need to send the font to the terminal. The way to do it, is to place the file from the font inside the Files To Send of you project, so that when you deploy/test the project the respective font will be sent to the devices.