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"Death Note, Primary Cause of Death": {
          "required": true,
          "answersConceptName": "Death Note, Cause, Answers",
          "autocomplete": true
}

Where,

  "Death Note, Primary Cause of Death" = Concept which has answers

You need to define following hierarchy of concepts (taking example of Chief Complaints here).
Here's the OpenMRS concept structure level.

• Chief Complaint Data (Is Set=true, class=Concept Details)

  • Chief Complaint (DataType=Coded)

  • Non-Coded Chief Complaint (DataType=Text)

• Chief Complaint Answers (DataType=Coded)

You can add Chief Complaint data to a concept-set which you are using for your form to show in Observations tab. 
All the coded answers should be added to Chief Complaint Answers and not Chief Complaint. This is a hack for now because of inability to ignore loading of children when loading a concept. When we load children it slows down the loading of the form

.

"Chief Complaint Data": {
   "answersConceptName": "Chief Complaint Answers",
   "autocomplete": true,
   "codedConceptName": "Chief Complaint",
   "nonCodedConceptName": "Non-Coded Chief Complaint",
   "durationRequired": false,
   "allowAddMore" : true
} 

If either of codedConceptName or nonCodedConceptName is not given, It will be treated as autocomplete with only coded values.
The name of this configuration can be either "Chief Complaint Data" or "Chief Complaint"
which is the name of <Concept Set> or <Concept Set Member whose DataType is coded>.

For multiselect configuration, Add the following to the config map

"multiSelect": true instead of "autocomplete": true 

"Chief Complaint Notes: {
    "conciseText": true 
}

"Posture" : {
    "buttonSelect" : true
}

"No of children" : {
    "stepper": true
}