I don't think so. But after you have your footnotes inserted, you could change them to the format you want with something like this.
Code:
Sub ScratchMacro()
'A basic Word Macro coded by Gregory K. Maxey
Dim oFN As Footnote
Dim oRng As Range
For Each oFN In ActiveDocument.Footnotes
With oFN
.Reference.Font.Superscript = False
.Reference.InsertBefore "["
.Reference.InsertAfter "]"
Set oRng = .Range.Characters(1)
End With
With oRng
.Collapse wdCollapseStart
.MoveStart wdCharacter, -2
.MoveEnd wdCharacter, -1
.Font.Superscript = False
.InsertBefore "["
.InsertAfter "]"
End With
Set oRng = Nothing
Next
lbl_Exit:
Exit Sub
End Sub
Note - This worked on a small sample document with 10 or more footnotes. Very limited testing. If it doesn't work on a larger collection of footnotes, or has manifests anomalies there we are. Nothing really I can do about it.