Convert each row to List

[donkey shrek]

How do I convert each row into a list without adding a new column?

What I have so far:

= Table.TransformColumns(TESTT, each Splitter.SplitTextByDelimiter(",", QuoteStyle.Csv)([TESTT]))

It gives error:
Expression.Error: We cannot convert a value of type Function to type List.
Details:
Value=[Function]
Type=[Type]

 

[RoryA]

It would be something like:

Table.TransformColumns(Source, {{"TEST", each Text.Split(_, ", ")}})

 

[donkey shrek]

It would be something like:

Table.TransformColumns(Source, {{"TEST", each Text.Split(_, ", ")}})

Thank you!