Creating a Custom Product Label

Hello! Thanks in advance for taking a look at my question.

I have long wanted a nice neat solution to adding an extra label on the store front. Many of our products are seasonal and will all have a specific delivery/collection date. In this case, I have a Valentines Day product that could do with a label saying "V-Day Exclusive" or words to that effect. I have tried using CSS from other posts, but nothing really hits the spot.

Aesthetically – black circle, white text, Sofia Pro, proportional to page.

Bonus thanks if the CSS provided can be easily tweaked for future occasions.

Let me know if you need any further clarity on the above.

I have attached a deliberately garish pink version so it's clear what my ask is.

Super, thank you Paul.

Can't believe I hadn't come across this.