check out this solution with Table.TransformColumns
Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("i45WMjTQNzDUNzIwMlAwMLYyNVCK1YlWUrDUNzaACBqagAVjAQ==", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type nullable text) meta [Serialized.Text = true]) in type table [Column1 = _t]),
Transform = Table.TransformColumns
Copy paste this code to the advanced editor in a new blank query to see how the solution works.
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Kudoes are nice too