Shelly motion API to trigger motion

I have a Shelly Motion 1 which is working well.

I have set up a Shelly Cloud scenes to:

• switch on a Shelly relay when motion detected
• switch off a Shelly relay when no motion is detected (i.e. switch off x minutes after last motion)

This all works well

However, I want to be able to call a URL/API to simulate a motion detected so that it will switch on the relay (then turn off if no further motion)

Is there a local API for the Shelly Motion I can call to make it 'think' it just saw motion?

Thanks for any assistance.