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If you are talking about Url property type only then please refer this post
http://www.ravindrarathore.com/blog/2020/04/15/use-of-episerver-url-class-in-propertyList.html
You will need to add follwing attirbutes on your Url property.
[JsonProperty]
[JsonConverter(typeof(UrlConverter))]
Please let me know if you are facing different issue.
Url (apparently I am still now allowed to include links): world.episerver.dk/documentation/developer-guides/commerce/catalogs/catalog-content/properties/#genericpropertylist
Simple cannot get it to work neither for ProductContent or NodeContent (as the example).
And before suggestion ContentArea/Blocks ... NO I hate this for "object lists" ... and a whole other disucussion.
So removed support for it and forgot to update docs?
Using 13.29.0 for own project, but also tested on Quicksilver ... no luck