Calamp attributes

Hi,
I just connected 3 Calamp GPS to my Traccar server.
The connection works great, but I need to add some attributes.
In the database i see some attributes in the positions table. I would like to add some calculated attributes in the web application.
For example, I have
-"input" with the values "33" or "1"
-"event" with the values "17" or "140".

Could you help me on how to configure the calculated attributes in the web application ?

Thank You

There is documentation for it.

Hi Anatoli, there is indeed documentation on this but no Expression for the defined parameters is described in detail

Who's Anatoli?