We did a number of things with HQMF - can demo what we did. The measure authoring tool GUI generates HQMF, which we can use to query a view we publish of OMOP.
We also made a GUI was not hardened for authoring data sets derived from OMOP. We suspended dev on it after the new CQF roadmap was released. CMS will replace query syntax with CQL, which is actually a real language.
Anyway, was just talking about revisiting a GUI with a developer familiar with the new standards, so happy to get requirements from Mayo/NW.
Some code here:
I will post the other repo later.