Adding an outside widget to composer

What I am trying to is to have users insert their specific widget from the composer where all the would have to do type a number and have the toolbar wrap around it. for example if typed 112756 it would wrap the following code around it.

<div id='PurpleAirWidget_112756_module_AQI_conversion_C0_average_10_layer_detailed'>Loading PurpleAir Widget...</div>
<script src='https://www.purpleair.com/pa.widget.js?key=N6HB6JJ0BP1Z05SE&module=AQI&conversion=C0&average=10&layer=detailed&container=PurpleAirWidget_112756_module_AQI_conversion_C0_average_10_layer_detailed'></script>

it would hopefully look something like this