Traffic Log Policy - provide a way to define logging file per dataplane

Would it be possible to have an option in the Traffic Log policy to define a file for dataplane?

* In our implementation of the mesh we can have several members on the same machine and when they both try to write in the same file it doesn't work.
* Would it be possible to let the possibility to customize this path in each one of those members ?

I believe we could use different TrafficLog resource based on source and tags, but if there are many number of services we may need to create too many TrafficLog resources.

Ideally we could define something like:

{noformat}- name: file
type: file
conf:
path: /tmp/{{ kuma_io_service }}_{{ my_label }}.log{noformat}