[Brett Merkey]

Yes, it is possible to use CSS to insert text into content. Use a pseudo-element.

Example:

p.scenebreak::before {
display: block;
content: "❖ This is a scenebreak ❖";
font-size: 1.5em;
margin: .2em auto;
text-align: center;
text-indent: 0;
color: midnightblue;
}

Then insert <p class="scenebreak"></p> in the desired place.