JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://raw.github.com/SteveSanderson/knockout.mapping/master/build/output/knockout.mapping-latest.js"></script>
<input type="text" data-bind="value: ID" />
<input type="text" data-bind="value: FirstName" />
<input type="text" data-bind="value: LastName" />
<input type="text" data-bind="value: Phone" />
<input type="text" data-bind="value: Municipality" />

JavaScript

var result =   {
        "TelemCalls": [ {"ID": 1, "duratio": "11"}],
        "ID": 1,
        "FirstName": "Jonas",
        "LastName": "Jonaitis",
        "Phone": "860123123",
        "Municipality": null
    };
      
function viewModel(result) {            
            return ko.mapping.fromJS(result);
        };
  ko.applyBindings(new viewModel(result));