Microsoft's "verbatim strings" aren't. Think of them instead as "Oops, we use a lot of backslashes here at Microsoft and over time that just looks more and more stupid" strings and then these actual raw strings make lots more sense than those did.
There's plenty of stuff in a middle ground where a separate template file is a waste. Your example, now that you've corrected it shows that nicely. A separate template would be a waste here for these few bytes, and yet "verbatim strings" mean instead of this just being some actual XML you can copy-paste it has to be escaped / unescaped.
If your issue is that you don't think string literals should be a thing at all, C# is the wrong language for you. Try one of the early numeric langauges, or something modern like WUFFS that eschews strings entirely because they're too dangerous. Once you accept that literals should be a thing (notice these aren't interpolated, they're just literals) this is an obvious idea.
The bad "verbatim" syntax should go away in favour of a raw literal syntax such as the one proposed here.