Dynamically Appended Script with window.onload Not Executing in GrapeJS

[fredrickreuben]

Describe the bug
I'm dynamically appending a script to the GrapeJS editor using the following code:

editor.DomComponents.getWrapper()?.append({
    type: 'script',
    content: globalJS,
});
Here is my script content:
window.onload = function () {
    alert('Page has fully loaded!');
};
However, the window.onload function does not seem to be executing as expected. My parser configuration is as follows: 
parser: {
    optionsHtml: {
        allowScripts: true,
        allowUnsafeAttr: true,
        allowUnsafeAttrValue: true,
    }
},

[fredrickreuben]

actual code i want to run is this

document.addEventListener('alpine:init', () => {
alert('ok');
Alpine = window.Alpine;
Alpine.data('global', () => ({
init() {},
}));
});