Not completely imitate, but get some pointers on concept and music from these two groups. JYP's ideas come from an era where iPhones and social media didn't exist yet so that why Itzy and NMIXX are being left behind. LESSERAFIM and NewJeans are more modernized and fit more American tastes, which is what JYP still wishes to advance to.
Immediately you can tell something that looks like it could have come from 2009 or from 2020s