Just wrote a quick blog post on this. Is there any interest in having this in druntime?
Another option, which we were discussing at extended beerconf (yes, it's still going on, though it's pretty lonely right now) is to just have mixin accept IES as-is.
https://www.schveiguy.com/blog/2024/12/using-interpolation-expression-sequences-for-code-mixins/
-Steve