You can target it by searching for a div containing the text “Country Taxes” — or by targeting the first div child of the parent which has a webflow class.
The problem is, webflow refreshes this div each time a user fills the checkout form, chooses a shipping method or changes his cart.
So you’d need your script to run each time this happens…
Here’s an old thread about the same thing : How can we edit tax text in ecommerce checkout?