@replacena not working with variables as replacement value

New to Julia
4

Ok, I had to remove my .julia to get a working Queryverse#master. This is the working syntax:

julia> using DataFrames, Queryverse, Statistics

julia> df = DataFrame(a=[1,2,missing], b=["One",missing,"Three"])
3×2 DataFrame
│ Row │ a       │ b       │
│     │ Int64?  │ String? │
├─────┼─────────┼─────────┤
│ 1   │ 1       │ One     │
│ 2   │ 2       │ missing │
│ 3   │ missing │ Three   │

julia> myMean = mean(skipmissing(df.a))
1.5

julia> q = df |> @replacena(:b=>"Unknown", :a => :( $myMean ) ) |> DataFrame
3×2 DataFrame
│ Row │ a   │ b       │
│     │ Any │ Any     │
├─────┼─────┼─────────┤
│ 1   │ 1   │ One     │
│ 2   │ 2   │ Unknown │
│ 3   │ 1.5 │ Three   │