The Knowledge Graph and Google My Business Profiles are Different Things
Knowledge panels are boxes that display information about (named) entities e.g. people, places, organizations, things that exist in the Knowledge Graph.
Knowledge panels for entities typically will include content obtained from a variety of different sources or domains. Ex: a knowledge ...
This doesn't depend on structured data. Google automatically defines important content and shows this in snippets. You can influence this, but no warranty, that your content will be shown like this. I know two popular ways to increase chances put main content into extended snippets:
Use tables with <table> tag
Use lists with <ul> tag
These are ...