Measure narrative currently displays supplemental data elements using a concatenation of the description element of each supplemental data element. There is no facility for specifying additional guidance at the measure level for collecting and reporting supplemental data. To support this, add the following extension: cqfm-supplementalDataGuidance 0..*     usage 1..1 CodeableConcept bound Extensible to Supplemental Data Usage     guidance 1..1 markdown Additional guidance for collecting and reporting supplemental data elements Also add a usage of this extension to the EXM124 example and display of this content as additional rows, one for each type of usage, to the liquid narrative.