additional metadata returned from a custom provider

[jonborchardt]

openapi does NOT return metadata with a compleation... like timing info,
but other models might.

right now, my custom provider returns a string, like the example.
1- can it instead return a json bob that contains metadata and message.. like:
{message: "model responds with 123", meta:{timing:bla}}
2- if it can, how do i query this data in the responseinfo object?

thanks agian!!