I would like to ask for the addition of a field to the submission/import JSON payload:

duration_played_ms: an optional integer field representing the number of milliseconds for which the track has been played for; mutually exclusive with duration_played, similar to duration and duration_ms.

relevant documentation: https://listenbrainz.readthedocs.io/en/latest/users/json.html#payload-json-details

As of now it is possible to report the duration of a track up to ms precision, however there is no (standardized) way of reporting the duration_played to the same precision

"duration_ms": 123456,
"duration_played": 123,