HTML Canvas - Comboboxes layer issue

not if you use the adobe components because components are placed on a layer above the canvas.

otoh, you could create your own components using js. for a combobox:

var d = document.createElement("div");

document.getElementById("animation_container").appendChild(d);
document.getElementById("animation_container").appendChild(canvas);  // make sure your canvas is transparent
d.display = "inline-block";
d.id = "cb_"+id;

for(var i=0;i<dataA.length;i++){  //  dataA = your jason array

var optionItem = document.createElement("option");

    optionItem.text = dataA[i].label;
    optionItem.value = i;

   d.options.add(optionItem);
}