Problems with Schema, JSON-LD - articles, blog entries, page

[Iwooo]

Hello, I'm trying to make a directory of companies on my webistes via records (in Pages app). I have more than 110 entries. 

I see in GSC than none of those entries has Aggregated rating. Is it possible to add? Here is an example: 
https://search.google.com/test/rich-results?id=0LZOZuh16kemsRJue9nBQA

Same here, 28 reviews that might be rich snippet... https://search.google.com/test/rich-results?id=2uTHRjYjmaI3HkEVGemX3g 

 

Here is something I would like to get: https://search.google.com/test/rich-results?id=As6ACTIfgzSTGgU3cfUWwQ
in search it looks like that:

Is there a way to add those aggregated ratings to my entries? I even have full reviews that may be added to schema, but I do not know how to do it on IPB. 

 

Also some blog entries have errors in Schema, how can I fix it? https://search.google.com/test/rich-results?id=XIL4Im7uPYrQfLtWdrgX6w

[Iwooo]

@Matt I saw that you wrote about JSON-LD and improvements in it for IPB. Do you have any solution for me? 🙂 

[Iwooo]

Is it maybe fixed/addressed in 4.6? Would be nice to get answer from someone. @Ehren - maybe you can help? Thanks in advance!