Just looking at the documentation nothing jumps out, but reading the plugin reference it seems like it would be an easy thing to add. You have access to read a

Just looking at the documentation nothing jumps out, but reading the plugin reference it seems like it would be an easy thing to add. You have access to read a file, you can get the current buffer, so inserting the text must be almost trivial. It seems like an odd showstoppper to have, but if you're tempted to switch writing the plugin might help you get a feel for how good the editor is in other ways.