Sure! Here are the codes:
-
Instagram Feed - Change font of all elements
-
Number Counter - Set custom font for all widget elements
-
Reviews (page and badge) - Set custom font for all elements in embed mode (Reviews)
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Reviews (side panel in badge):
.es-layout-sidebar-scrollable-container {
font-family: Calibri;
}
I’ve also added these ideas to the Wishlist on your behalf 
Since there is no font setting for the Instagram now, you can upvote this idea here - Font setting