I think they are wasting an opportunity considering all members can stand on their own popularity -wise .
She is definitely popular with the Japanese fandom (especially with male fans) she ranked #1 in popularity with young & teens in their 20's in Japan and #2 overall.
the brand she is endorses (global ambassador for fashion and beauty) ranked #1 in global ranking. In addition, Jisoo was the inspiration for Dior AW2021 collection.
Dior topped the biggest regions of fashion: China, Europe & USA in the 4th Quarter of 2020