ES2015 template strings from the beginning supported "tagged template literals" where the tag is a function that gets the template itself and the objects passed to the "holes" in the template as separate arguments. From there that function can do things like turn the holes themselves into something like SQL Parameter syntax and wrap the things that go in those holes in properly escaped SQL Parameters.

`some template {someVar}` was f-strings and someFunction`some template {someVar}` was more like what these t-strings provide to Python. t-strings return an object (called Template) with the template and the things that go into the "holes", versus tagged templates are a function calling pattern, but t-strings are still basically the other, richer half of ES2015+ template strings.