There is definitely support, but it is nowhere near what is documented in FHIR website. You can look at the search capabilities for example : https://www.hl7.or

There is definitely support, but it is nowhere near what is documented in FHIR website. You can look at the search capabilities for example : https://www.hl7.org/fhir/search.html https://www.hl7.org/fhir/search.html.