Hello Gregory
You should be able to use that font by adding the "font-family" attribute to the form's CSS in the code editor. If you want to style font in an HTML component for example, you could add that as an attribute for <span>.
<span>
{
font-family: roboto !important;
}
If you want to style the font for the field labels, you'll have to add that as an attribute for the CSS for the field labels.
.clickdform input[type='text'],
.clickdform textarea,
.clickdform select
{
font-family: roboto !important;
}