Hi Ann,
Thanks for writing in! You could use the page ID and add custom CSS to declare font family for any specific page.
Example :
body.page-id-10 {
font-family: "Lato", sans-serif;
}
For any element:
.page-id-10 .your-element-class {
font-family: "Lato", sans-serif;
}
You can find your page ID by following this : https://theme.co/community/kb/how-to-locate-post-ids/
If you have additional question then provide your URL and let us know specifically.
Cheers!