You can add custom text to tags or priced signs with a setting called alt text.

Tap & hold your price and then tap Settings:

Use the Alt. Text section to add any custom text you need.

Let's skip all of the above and tell Tagify we know what we're doing. Go back to your price point, tap on it. When the number pad comes up, hits those dots in the bottom left:

Instead of just being able to edit the price, now we can edit the X/For, quantity and alt text from right here.