Here is a simple example on how you can add the text content tag
<sf-text id=":1"></sf-text>
<!-- Example output -->
<h1>Example</h1>
<p>Testing 123... is this thing on?</p>
If you need to limit which elements the user are allowed to use, you are free to include only those elements like this:
<sf-text
id=":1"
include="h1,p,link"
></sf-text>
These are the elements you can use within the include attribute.
<sf-text
id=":1"
include="p,h1,h2,h3,h4,h5,bold,italic,link,align,bullet,number"
></sf-text>