How can I get the font family from a font?

[isaacfink]

I am trying to load fonts for use with sharp js, I need the font family in a way that it will be recognized by sharp (using fontconfig) I don't know enough about fonts but is there a font family? not specific to languages but something universal that I could use, and if there is how can I get it with opentype?

[forresto]

Meaning this?

const family = openTypeFont.getEnglishName("fontFamily");
const variant = openTypeFont.getEnglishName("fontSubfamily");