Google's review data is one of the most valuable things it provides.
When doing quick searches where the objective is to compare businesses, the Google reviews are very helpful and generally more indicative of the real quality of the restaurant/commerce/doctor/tourist attraction/etc.. than Yelp, for example.
Simply adding the star rating with a link to the reviews would enrich the Kagi offering:
Until a reliable review platform decoupled from Google comes along, this is the best option in my opinion for including this feature into Kagi.