Custom text if no reviews

Hi,

In order to be able to engage my audience in reviews, I was hoping someone can help me accomplish this:

On listing that do not have any reviews, in the review section, I would like to add some custom text to push people towards reviewing them, something like “This place has no reviews yet, help others by leaving a review”

If there are reviews, the text should either disappear, or be able to change it to some other text.

Is there an easy way to do this, and/or where do I add this? – Note that I am not a coder, but am able to navigate and edit files in the backend if need be.