Set relay activation time

I am looking at controlling the opening and closing of a car gate (NICE ROBUS) via my door intercom (BTICINO/LEGRAND) via a Shelly 1 Plus.

The BTICINO intercom has a relay for the purpose of opening things. I've connected this to the Shelly so that when the BTICINO intercom button is pressed, the BTICINO relay activates which in turns activates the Shelly relay. This all works.

However the ROBUS input for open/close commands requires a pulse signal to work correctly - the relay needs to activate for about 0.2 seconds only. Any more and the step-by-step gate opening does not work correctly.

So this is where I am stuck as the BTICINO relay has a minimum activation time of 1 second (which is why i cannot connect the BTICINO relay directly to the ROBUS) so this in turn activates the Shelly relay for 1 second. What I need to do is get the shelly relay to activate for just 0.2 seconds.

I thought it might be done via the Auto Off Timer option, but that only seems to be a minimum of 1 second as well (via the mobile app anyway).

If the timer option is not suitable, I was wondering if DETACHED mode might offer a solution by activating the relay via a script. Not scripted any shelly's before so unsure if it's possible to set an activation time of 0.2 seconds via script or not?

Thank you for any help in advance

Thank you for confirming it is possible! I was able to enter the value of 0.2 using the web browser interface.

Previously I had been trying to do it via the iOS app and that does not give you the option to enter a decimal point (see screenshot), so I had assumed it therefore had a minimum of 1.