The glyphs for the four Extension G ideographs were designed by members of our design team in Tokyo. Yui Yoshitomi (), a former member of our design team, designed the initial glyphs for two of the ideographs, the ones for biáng (the traditional form is the ideograph on the left in the animated image above). Taisei Yoshida () subsequently tweaked those glyphs, which involved expanding the traditional form to encompass four separate region-specific glyphs, and he also designed the glyphs for the two additional Extension G ideographs, such as taito (the 84-stroke ideograph on the right in the animated image above). Of course, these glyphs were checked by Ryoko Nishizuka (), who oversees the design of these Pan-CJK typefaces.
アドビが作った新しいフォント、"Source Han Sans"のv2.0、これになんと例のビャンビャン麺、
For now, because Extension G code points are not yet stable, these glyphs need to be entered via their IDSes (Ideographic Description Sequences) that are subsequently processed by the 'ccmp' (Glyph Composition/Decomposition) GSUB feature. See the “CJK Unified Ideographs Extension G” Section and its table on page 13 of the official ReadMe file for more details.