Why is the specified font not saved when exporting from Figma to Mokup?

Question

User interface

Hello, there was a problem when exporting an artboard from Figma to Mokup, a prototyping app. It seems that the export goes without any complaints, but for some reason, the font, after export, in Mokup is completely different, unlike Figma. For example, in Figma I used the Jelytta font, but in Mokup this font is completely different. Some, I would say, standard and typical. It feels like Mokup does not see the fonts installed on the computer. Who used Mokup help, please.