Join and expand 2 tables

Based on the limited sample dataset,

let
    PermissionPath = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("i45WMjAwVdIBk7E6QJ6hAYRXA2KBRYyQRGpAvNhYAA==", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type nullable text) meta [Serialized.Text = true]) in type table [Permission = _t, Path = _t]),
    #"Sorted Rows" = Table.Sort(PermissionPath,{{"Path", Order.Ascending}}),
    #"Transformed Path" = Table.TransformColumns(Table.RemoveColumns(#"Sorted Rows",{"Permission"}), {"Path", each Text.Split(_, "|")}),
    UserPermission = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("i45WCi1OLTJU0lEyMDBVitWB8I1AfEMDpdhYAA==", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type nullable text) meta [Serialized.Text = true]) in type table [User = _t, Permission = _t]),
    #"Selected Path" = Table.TransformColumns(UserPermission, {"Permission", each let l=List.Last(List.Select(#"Transformed Path"[Path], (l) => List.Contains(l,_))), pos=List.PositionOf(l, _) in try List.RemoveRange(l, pos-1) otherwise l}),
    #"Expanded Permission" = Table.ExpandListColumn(#"Selected Path", "Permission")
in
    #"Expanded Permission"