Using a custom icon font in a card
I've created a custom font that consists of 15 simple icons. Each icon is mapped to a single character position. For example, typing an "A" produces the first icon, typing a "B" produces the second icon, etc. The font is an OpenType font, and it works correctly in all my desktop apps. I'd like to use this font on a card.
I've uploaded OTF files for both this custom font as well as another OTF text font (Prelo) in Content & Layouts > Fonts.
I have a card that contains 2 Text Area fields: Description and Title. Description uses my custom font, and Title uses the Prelo font.
In the collections that are mapped to this card, I have an "A", "B", or "C" in the Description field, and my actual collection title in the Title field. So I would expect that this would cause an icon to appear on the first line of the card, followed by the collection title displayed in Prelo on the second line.
But the icon font doesn't display the icon. It only displays a capital A, B, or C. The card title using the Prelo font appears correctly.
Is this not possible? I would expect the icon font to work correctly, since the system doesn't have any way of knowing that the "A" looks different than a regular A, the B looks different than a B, etc.
By the way, I've tried viewing this in both my custom Preflight app as well as my custom development app on iOS and Android.