Apply a column of anonymous functions for each column in a column subset

Specific Domains Data
2 
julia> combine(df, vcat.(["x1", "x2"], "xfun") .=> ByRow((x,f) -> f(x)) => first)
3×2 DataFrame
 Row │ x1     x2
     │ Int64  Array…
─────┼───────────────────
   1 │     0  [0, 1]
   2 │     4  [9, 16]
   3 │    27  [125, 216]

and instead of ["x1", "x2"] provide an expression that generates the column names you want to include.