Welcome and thank you for reaching out. 
LightBurn provides support for what are called ‘Single-line Fonts’ or in particular, ‘SHX Fonts’, which you can learn more about here:
Single Line Fonts
SHX fonts are quite old, and came from AutoCAD where they were originally made for plotters. Some SHX fonts are truly “single line” while others are more complex, but the single-line versions are perfect for when you want text, but you want it drawn quickly.
In the settings, under File Settings, there’s a new button to choose the location of your SHX fonts folder. Download some SHX fonts and tell LightBurn where to find them, and they’ll show up in the fonts drop-down.
Video Explainer
Docs
Font Collection