Extraer texto

Aquí hay una versión básica sin ninguna comprobación de errores. Agregue eso según sea necesario.

let
    Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("hY/LCsIwFER/ZejKQgN5EeKymhKLaSm3KoHS//8Nm8Sq4MLVLM65c5llqS4ThPEnHERMWUNS1JjOKjAhLedUrc3b+id1pUsUqpnUnN8YwfXDkJWMMzkqBXdvA6N2vCJaOEc6O/ZbmfvRh+5XSr+U3MzUgYJ1xq/qvjw0em8zxuDBqAF1HrOjdoD029G+L7dtA1PW0J+B3HAeYKt1fQI=", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type nullable text) meta [Serialized.Text = true]) in type table [Column1 = _t]),
    #"Added Custom" = Table.AddColumn(Source, "Custom", each 
    let g = Text.PositionOf([Column1],"GB"),
    sp = Text.PositionOf([Column1]," "),
    st = if sp<g then Text.Range([Column1],sp+1,g-sp+1) else Text.Start([Column1],g+2) 
in 
    st
)
in
    #"Added Custom"