Anyone have a good process for Schema.org auditing?

[MJTrevens]

I am looking to do a Schema.org audit across a large number of websites that all run on the same platform. I'm not really sure where to start and what format to use for a deliverable. I suppose starting by checking for errors on the current schema and documenting them and then moving on to additional schema that could be added to the JSON+LD?

My last structured data audit I just used a spreadsheet and it didn't come out as neat as I would have liked.

Anyone who has some experience in this, your input would be much appreciated!

[Andrew-SEO]

Yes I'm currently doing this for a number of sites

An audit would be testing the current implementation

Identifying new itemprops to add as you say.

And identifying the snippets and serp features that the site has the potential to compete for.