Creating Parameter on MicroflowCallParameterMapping usin SDK?

How do I add a parameter using the SDK to a microflow call action?

I've created in order a:

• MicroflowCallAction
• MicroflowCall on MicroflowCallAction
• MicroflowCallParameterMapping on MicroflowCallAction

Now, how do I add a Parameter on the MicroflowCallParameterMapping?

I couldn't find any documentation or example Typescript code fore this. This is what I've got so far:

let microflowCallAction = microflows.MicroflowCallAction.createIn(actionActivity);
let microflowCall = microflows.MicroflowCall.createIn(microflowCallAction);
let destMF = <microflows.Microflow>workingCopy.model().findMicroflowByQualifiedName(microflowName);

microflowCallAction.microflowCall.microflow = destMF;

console.log(microflowCallAction.microflowCall.parameterMappings.length);
// Logs 2

let parameterMapping = MicroflowCallParameterMapping.createIn(microflowCall);

// How to add the parameter?
parameterMapping.parameter = ????