documentclass{standalone}
usepackage[linguistics]{forest}

begin{document}
begin{forest}
  [CP
    [C,
      for c-commanded/.process=Ow{name}{tikz={draw[->](#1)--();}}
    ]
    [TP
      [T]
      [VP
        [DP]
        [V'
          [V]
          [DP]
        ]
      ]
    ]
  ]
end{forest}
end{document}