We are currently rescripting our theme. The current version uses microdata for structured data, but Google doesn't seem to handle microdata completely well, therefore we are switching to JSON-LD.
When we analyze our current microdata setup with Google's Structured data testing tool, no HTML tags are shown. When we parse the content of our (WordPress) blogpost into JSON-LD it does contain HTML tags, which also show in the structured data testing tool.
Few hours of googling haven't given me a substantiated answer if we should strip the text from all HTML markup (or some?) or if we should keep it in our JSON-LD setup.
Hope anyone can give me a substantiated answer.