In addition to the standard fonts, you can also add other free and paid fonts via the LG SmartWorld app, and after downloading the font, you can activate it in the settings.

Android 9 | LG UX 9.0
Step 1:  Open the  Settings
Step 2:  Tap on  Display
Step 3:  Tap on  Font
Step 4:  Tap on  Add fonts
Step 5:  Tap on desired  Font
Step 6:  Tap on  Download
Step 7:  Tap on  Set
Step 8:  Tap on desired  Font
Step 9:  Confirm with  Apply
  1. Open the Settings
  2. Tap on Display
  3. Tap on Font
  4. Tap on Add fonts
  5. Tap on desired Font
  6. Tap on Download
  7. Tap on Set
  8. Tap on desired Font
  9. Confirm with Apply

LG Instructions