JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://github.com/SteveSanderson/knockout/raw/master/build/output/knockout-latest.debug.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.7.2/jquery.min.js"></script>
<select data-bind="options: oCountries, optionsText: 'name', optionsValue: 'isocode', value: selectedIsocode">
</select>
CRM data controller: <span data-bind="text: selectedCountry().crmdatacontroller"></span>

JavaScript

var countries = [
    {
    "name": "Afghanistan",
    "isocode": "AF",
    "language": "English",
    "crmdatacontroller": "CRM India"},
{
    "name": "Aland Islands",
    "isocode": "AX",
    "language": "Finnish",
    "crmdatacontroller": "CRM Finland"}
]

var viewModel = {
    oCountries: ko.observableArray(countries),
    selectedIsocode: ko.observable('AX')
};

viewModel.selectedCountry = ko.dependentObservable(function() {
    var selectedCode = this.selectedIsocode();
    return ko.utils.arrayFirst(this.oCountries(), function(country) {
       return country.isocode === selectedCode;
    });
}, viewModel);

ko.applyBindings(viewModel);