It would be great to be able to declare a Matrix Combination Parameter in declarative pipeline. Code like this (found at https://jenkinsci.github.io/job-dsl-plugin/#method/javaposse.jobdsl.dsl.helpers.BuildParametersContext.matrixCombinationsParam) does not work:

pipeline {
   parameters {
     matrixCombinationsParam 'TARGET_ARCHS', description: 'Target platforms to build engine for'
   }
}

 Or maybe it is currently somehow achievable via '$class' and 'MatrixCombinationsParameterDefinition' (if yes, then this should be documented)? 

properties([
  [$class: 'ParametersDefinitionProperty',
   parameterDefinitions: [
     [$class: 'MatrixCombinationsParameterDefinition',
       name: 'TARGET_ARCHS',
       description: 'Target platforms to build engine for'
     ]
   ]
 ]
])

pipeline {
   ...
}

The code above leads to:

 TARGET_ARCHSNot applicable. Applicable only to multi-configuration projects.

Also don't know how to use the approach with 'properties' above to extend the set of parameters with a new MatrixCombinationsParameterDefinition one instead of overwriting the entire parameter list.