Is it possible to define custom metaoperators in Raku?

The standard way to define a new operator in Raku is

multi sub infix:<operator> ($l, $r) { ... }

With different options instead of infix. I would like to define a custom meta operator, however. The closest I can come (matching the idea of @a X+ @b) is

multi sub prefix:<F> (&bar) { ... }

But while it compiles, the only way to get it to work with, e.g., the + operator is to use an full identifier:

(F&infix:<+>)($a, $b)

Or are metaoperators definable?