Support for modifying kubernetes labels

[kborovoy-ebsco]

Bug Report

Describe the bug
Hi,
Maybe I'm missing something, I want to add a new record foo.bar based on existing labels.app using FILTER:modify.
But it doesn't work.

To Reproduce
Was trying the following variants:

    [FILTER]
        Name        modify
        Match       *
        Add         foo.bar $kubernetes['labels']['app']

OR

    [FILTER]
        Name        record_modifier
        Match       *
        Record      foo.bar $kubernetes['labels']['app']

OR

    [FILTER]
        Name        modify
        Match       *
        Condition   Key_exists kubernetes['labels']['app']
        Copy        kubernetes['labels']['app'] foo.bar

Additional context
Also, I tried an LUA script and it works. But my goal is to use a FILTER:modify or maybe record_modifier if it's possible.

[kborovoy-ebsco]

also I tried, still doesn't work

    [FILTER]
        Name           nest
        Match          *kube
        Operation      lift
        Nested_under   kubernetes
        
     [FILTER]
        Name modify
        Match          kube.*
        Copy           labels.app foo.bar