Currently, we can use the Dynamic Data option to access CPT / CCT meta fields in the Conditions tab. The problem is that is very limited. Would be great to be able to access the Queries built with Query Builder also (it would need to work the same as a CPT / CCT is shown. (Query Builder - List of Queries // Query Builder (SQL) - List of Queries and Variables). It would avoid us the rastle to use a work around as described in the below posts.