Call a constructor by interpolation

I need to programmatically initialize an empty DataFrame using a vector of names and a vector of types:

Here is an example of doing this explicitly:

DataFrame(mystrings=String[],myints=Int64[])
0×2 DataFrame

MWE for doing this programmatically:

nm = ["mystrings","myints"]
tps = (String,Int64)
expr = :(DataFrame($nm .= $tps))
eval(expr)

ERROR: MethodError: Cannot `convert` an object of type Type{String} to an object of type String

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