replace a value within text but only between square brackets

Anonymous 
Please add the following custom column where I replace the "," with "|" within the [...]

let T=Text.BetweenDelimiters(_[Data], "[", "]") in Text.Replace( _[Data],T, Text.Replace(T,",","|" ))

Orginal Text:

|
Result:

Full Code:
Create a blank Query, go to the Advanced Editor, clear the existing code, and paste the codes give below and follow the steps.

let
    Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("JcxBDsIgFATQqzR/bRRiEdudK89ggBCEr6KRNh9YeHtL2E1mXkYpKK9Iwa6Oys8+agoY5kHDDbOG3RYo5o/NfiHUMA9iP7ay4ObIupwrueTRkisxPZvQcPnekQ5XQkz9YqXljb7YVNvSkNJwPklxZFMXUnIxiZ45k3xkGgwY8wc=", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type nullable text) meta [Serialized.Text = true]) in type table [Data = _t]),
    #"Changed Type" = Table.TransformColumnTypes(Source,{{"Data", type text}}),
    #"Added Custom" = Table.AddColumn(#"Changed Type", "Custom", each let T=Text.BetweenDelimiters(_[Data], "[", "]") in Text.Replace( _[Data],T, Text.Replace(T,",","|" )))
in
    #"Added Custom"