Hi Brendan,
I believe you meant H5P.
AFAIK there are no optional properties to create a scrollable section.
But this could be done by adding the HTML and CSS code directly. I'm attaching an image showing the final result.
You need to click on the "Source" icon from the toolbar and enter a "<div>" container with the following styles:
<div style="height:200px; width:300px; overflow: scroll; border:1px solid gray; padding:10px">
</div>
Of course, you could modify the values for width and height, and so on. You could put there any content you want between the opening and closing <div> </div> tags and it will be scrollable. However, it looks like the scrollbar icon doesn't show by default in Mac, so you would need to add a "Styles" section from the "Optional Properties" column and enter the following styles:
::-webkit-scrollbar {
-webkit-appearance: none;
width: 7px;
}
::-webkit-scrollbar-thumb {
border-radius: 4px;
background-color: rgba(0,0,0,.5);
-webkit-box-shadow: 0 0 1px rgba(255,255,255,.5);
}