Preset variables in query parameters does not work for Webhook integration

[niels.reflektor]

I've tried to create a Webhook integration with the following parameters:
HTTP Method: POST
Request Format: Custom Body

I find that preset variables does not work for the query parameters - the preset variable key string it just passed on without replacement. I.e. for DEVICE_NAME, I receive that very same string (DEVICE_NAME) at the end point.

I notice that if I check the "use preset" checkbox and press save, the the box is unchecked when I review the configuration afterwards. I.e.

Before Save:

After Save, Edit:

The preset variable replacement works fine for the Custom Body field.

Can you help me with a solution?

A side note: it would be very useful if it were also possible to use the preset parameters in the URL field.

Thank you in advance.