Found
https://github.com/rsyslog/rsyslog-doc/commit/912bc5dcc54966be2cea9890c81414a1e96a94ce
however it isn't working as expected (or at least how I expect)

On Mon, Mar 6, 2023 at 9:00 AM Tan Mientras <tanimient...@gmail.com> wrote:

> Is it possible to filter depending on a field that may exists or not in a
> json message?
> Something like:
>
> # if property is not set
> if ! $!source_app then {
>     action(...)
> }
>
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