Serif font issue in Asian languages in Articulate RISE

I was working on Japanese and Chinese rise courses, which has both 'Serif' and 'Sans Serif' fonts used in throughout the courses. Like 'Serif' for all headings + menu and 'Sans Serif' for body text. 

I want to reflect the same font style appearance in my Japanese and Chinese courses as per the English course, but I realized that maybe Articulate RISE don't support 'Serif' font style in Asian languages?

If that's a bug, then I would like to request feature request.

Here are the things that I tried:

• I created custom fonts for both Serif and Sans Serif styles.
• The custom fonts I used are Google free fonts, which are Noto Serif and Noto Sans Serif fonts.
• Converted all TTF fonts to WOFF and uploaded in Theme > Fonts
• Noto Sans Serif does reflect the proper 'Sans Serif' look but Noto Serif won’t.
• All 'Serif' font appear in 'Sans Serif' only
• Tried Adobe Serif fonts of Japanese and Chinese but same issue.

I have attached screenshot of all three course for reference here