Futures Trailing Stop available in UI but not exposed in REST API?

[F3nryll]

Hi,

I am using Gate.io Futures API (v4) and I noticed that the web UI supports
a Trailing Stop order type (shown under "Trailing Stop" tab).

However, when inspecting the REST API:

• GET /futures/{settle}/orders
• GET /futures/{settle}/price_orders

I cannot find any order structure that represents a trailing stop
(no callback_rate / pullback_rate / activation_price / trailing fields).

Questions:

1. Is the Trailing Stop order available via public REST API for Futures?
2. If yes, which endpoint and parameters should be used?
3. If not, is it UI-only (internal service) and not exposed to API users?

Also:
Is there any way to link a price-triggered order (stop-loss) to a position
so that it is automatically cancelled when the position is closed?

Thanks