segregated witness – Pycoin: How you can signal SegWit transaction by way of Pycoin?

My goal is to make transaction with unspent transaction outputs(UTXOS).
The data of UTXOs is as comply with.

[   
  {
    "pt_idx": 0,
    "subaccount": 37,
    "ga_asset_id": 1,
    "value": "92343",
    "block_height": 1288714,
    "txhash": "9e2d2d56632b609e9b5d0a1990cf0ffbd9865cec558b68ed106df352fd89cfb1",
    "pointer": 1083,
    "script_type": 14   
  },
  {
    "pt_idx": 1,
    "subaccount": 37,
    "ga_asset_id": 1,
    "value": "9961066",
    "block_height": 1288718,
    "txhash": "b0e37f463aba4e3abb078eb77c472b29621cfdd17ed83ae41122b0b95df5e518",
    "pointer": 1096,
    "script_type": 14   
  },
  {
    "pt_idx": 1,
    "subaccount": 37,
    "ga_asset_id": 1,
    "value": "315595",
    "block_height": 1288721,
    "txhash": "b062efcab010d436ca2f6bed0dc61b90d8cbced756e1ed7cc7593cac30d87326",
    "pointer": 1099,
    "script_type": 14   
  },
  {
    "pt_idx": 1,
    "subaccount": 37,
    "ga_asset_id": 1,
    "value": "1872759",
    "block_height": 1288716,
    "txhash": "f88cfdb328f9d298b0ff8a641198d3e63ea7efaf6f98f5692ba3f88a03a73c2b",
    "pointer": 1088,
    "script_type": 14   }
]

From these I made transaction utilizing pycoin library.
By the way in which, it’s troublesome to signal a SegWit transaction.
If anybody is aware of about this, please inform me.