It’s fine, I use em dashes all the time in papers. If you do it correctly—to add more information or commentary to your overall point—instead of at random and without proper syntax you’re not going to get accused.

Don't let LLMs take your em dashes; flattening your language to the lowest common denominator to avoid doing anything too distinctive less you be accused of non-authorship.. that's a real harm to you and your reader. If you know how to use them, and enjoy using them, use them fearlessly.