google font entry in config.toml not taking effect

[Jimmy99]

I made the following entry in the config.toml to change the font but it's not taking effect. I copied the google_fonts entry from https://fonts.google.com/specimen/Jost. Can you see anything obvious that I've gotten wrong?:

[params.fonts] google_fonts = "https://fonts.googleapis.com/css2?family=Jost:wght@300&display=swap" heading = "Jost" base = "Jost" monospace = "Jost"