In this interview from 2021, the producer/head manager of HoloEN claims that it was their pitch/idea that got HoloEN made in the first place.
https://grapeejapan.com/169910
You can also go back and watch Coco's first stream straight after the Myth debuts (if I remember correctly) where she implies she had no idea who any of the HoloEN members were prior to debut to kill the common assumption she had something to do with auditions.
As far as HoloEN goes, Coco can be attributed to causing massive growth for the Hololive brand in general, leading to an increase in staff and international interest that possibly lead to it's eventual creation, and advertising for it once on AsaCoco. Outside of those instances I don't think she had anything to do with it at all.