[Solved]-How to load a Highcharts options object, including a callback property, with getJSON-Highcharts

You can try to move you json options to script (come options.js). For example:

//options.js example
window.chartConfig = {
 charType: 'spline',
 tickPositioner: function() {console.log('bla-bla')}
}

// in some main script
$.getScript('options.js')
    .done(function () {
            window
            $('#chartholder').highcharts(window.chartConfig);
    });