Average Score

Hello,
I am planning to create Average Review score based on major Review Sites like Google Business profile, Yelp, BBB, Bird Eye. Only Admin will create these revies by import using ALL Import plugin, users should not be able to rate and post reviews.
?
Instead of using usual categories like: Service Quality, Price, Support … I will need to be able to display ratings from 0 to 5 from each review platform mentioned above. In some cases some companies(listings) may not have reviews at all(let say YELP), usually the score is calculated for example Google(5), Yelp(4) & BBB => (5+4+3)/3=4
In case company(listing) doesn’t have reviews in Yelp at all I would like the calculation process to skip/omit missing values(zeros) and be: (5+0+3)/2=4.

Is this something I can achieve with your plugin, ether by changing plugin settings or using some snippet? If Not, would it be possible to import categories ratings: Google(5), Yelp(4) & BBB In-dependably from Average Score(4) so the total score is a value I create and represents the result I am after? I am open to any work arounds.