Internal-Only Comments

We use shared boards a lot to manage client projects. In these instances, our staff are internal members and clients have Guest access to the board. There are often instances where we would like to ask questions or share thoughts on a task internally without the client being able to see them. In Jira this is possible with tickets using their “Internal Comment” option. I would like to see something similar in Monday so that most comments are public, but when required a comment can be flagged as internal and is no visible to Board Guests.