<<< native
[ ESuper
    (EDelimited
       "("
       ")"
       [ Right
           (EArray
              [ AlignCenter , AlignCenter ]
              [ [ [ ENumber "0" ] , [ ENumber "1" ] ]
              , [ [ ENumber "2" ] , [ ENumber "3" ] ]
              ])
       ])
    (ESymbol Alpha "T")
]
>>> eqn
{left ( matrix{
ccol{ 0 above 2 }
ccol{ 1 above 3 }
} right )} sup T