To do it yourself,

You will go to https://www.wikidata.org/wiki/Wikidata:Main_Page

MAKE an account then you will create an entree.

Like this https://www.wikidata.org/wiki/Q42672285
https://www.wikidata.org/wiki/Q213854

Here is a video that shows you how to do it: https://www.youtube.com/watch?v=3CuUgJK4L78

Once an entree has been created, it takes about 1 -2 weeks for knowledge panel to appear. do not tell your customer about how to create knowledge panel.

To Order From Fiverr: https://www.fiverr.com/search/gigs?query=google knowledge panel&source=top-bar&ref_ctx_id=2ddb22bce05e8684ca6fbeef0ced0aae&search_in=everywhere&search-autocomplete-original-term=google knowledge panel