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The parent asked for a Lisp dialect. R is not a Lisp dialect. It's ridiculous to claim there's a "Scheme" in R. R is not Scheme, it's not even close.

It’s much closer than people think. R originally built on a Scheme runtime, and the DNA of Scheme is still lurking pretty close to the surface.

The meta programming facilities in R still look very lispy, and are used to good effect throughout the Tidyverse family of packages.

If I had one wish, it would be to see something like the Tidyverse exist in something still closer to Scheme... like Racket.

If it's all Scheme under the hood, why can't it be backported easily?

This is valid R

  sum(1:10)

This is also valid R:

  (sum (1:10))

Just wrapping whatever in parentheses does not make a lisp.