AISystemUse: Signal/Metadata for output modality

[achimschloss]

The following metadata signal seems to be missing at least in AISystemUse:

As a content owner I would want the ability to define/be informed about the intended function of the content usage, but also the intended modality of the output (Text, Audio, Video, Image, ....).

[hillslatt]

oh that's a good idea! i'll add it to the next WG discussion for 1.1