I'm building a desktop application and I'm downloading font ".ttf" files from Google Fonts with the application. I've managed to do that by utilizing the JSON response from the Developer ...

A OpenType/TrueType font file should contain a "name" table, which has an array of so-called "Name Records" that provide all kinds of information like font name, version, creator, copyright, license, etc.

Fore example "Open Sans" has (among others) these two Name Records:

nameId: 13 (License Description)
text: "This Font Software is licensed under the SIL Open Font License, Version 1.1. This license is available with a FAQ at: https://scripts.sil.org/OFL"
nameId: 14 (License Info URL)
text: "http://scripts.sil.org/OFL"

The Hack license comes in three parts. The Bitstream Vera license must be maintained based upon the language and includes reserved font names for "Bitstream" and "Vera" along with other stipulations.

We acknowledge the public domain contributions of the DejaVu group in the statement:

Frequently asked questions about font redistribution

• We view creating graphic files as being essentially the same as printing from an output device.

Can I make a company logo using the fonts?

Unless you are using an application that is specifically licensed for home, student, or non-commercial use, we do not restrict you from making logos using the Windows-supplied fonts.

When can I use document embedding?

Font files contain flags that indicate if and how they can be embedded within a document file. Applications that support document font embedding look at these flags and determine if and how it may be embedded in a document file, and when they open a document containing embedded fonts, they will also look at these flags to determine if and how a document can be viewed or edited.

https://www.fonts.com/content/microsoft-typography