@Nitram @chipriley I was able to get around the font issues with a custom css file. I created the following file, /config/www/custom-lovelace/font.css:
body {
font-family: "Lato", sans-serif !important;
}
And then, in my resources section of my Lovelace config, I added the following:
- type: css
url: /local/custom-lovelace/font.css
That seems to have successfully overriden the font everywhere in my setup.