Regarding bracket order

In zerodha, if I have a short option position, you allow me to place 2 exit orders- one sl and one target order without requiring any additional margin. I can place these orders separately and now you have introduced GTT orders where I can enter the sl and target order in one order window. However, the GTT is only for NRML orders. Could you enable it for MIS orders as well. And what is the reason for not allowing OCO orders from the order window itself? @Bhuvan