Is it possible to create a query from text?

Very cool! Didn't know about that function, mahoneypat. Can this handle more complex queries? I keep getting an error when I try something like the following:

= Expression.Evaluate(    "Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText(""i45WclTSUTI0MFCK1YlWcgKyjaBsZyDbGMSOBQA="", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type nullable text) meta [Serialized.Text = true]) in type table [Name = _t, Value = _t]),
    #""Changed Type"" = Table.TransformColumnTypes(Source,{{""Name"", type text}, {""Value"", Int64.Type}}),
    #""Filtered Rows"" = Table.SelectRows(#""Changed Type"", each ([Name] = ""B""))""""")

Here's the original in the Advanced Editor:

and here's the original code:

let
    Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("i45WclTSUTI0MFCK1YlWcgKyjaBsZyDbGMSOBQA=", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type nullable text) meta [Serialized.Text = true]) in type table [Name = _t, Value = _t]),
    #"Changed Type" = Table.TransformColumnTypes(Source,{{"Name", type text}, {"Value", Int64.Type}}),
    #"Filtered Rows" = Table.SelectRows(#"Changed Type", each ([Name] = "B"))
in
    #"Filtered Rows"