MPRIS xesam:url is empty

[ungive]

The xesam:url property is missing with with MPRIS metadata from tidal-hifi:

$ playerctl -p tidal-hifi metadata 
tidal-hifi xesam:title               Hard to Sleep
tidal-hifi xesam:artist              Gracie Abrams
tidal-hifi xesam:album               When The World Stopped Moving
tidal-hifi mpris:artUrl              https://resources.tidal.com/images/ec0516d1/6b99/4739/bbf7/8c70b342f336/640x640.jpg
tidal-hifi mpris:length              255000000
tidal-hifi mpris:trackid             '/org/mpris/MediaPlayer2/track/204259342'
tidal-hifi custom:title              Hard to Sleep
...
tidal-hifi custom:url                https://tidal.com/browse/track/204259342
...
$ playerctl -p chromium.instance686813 metadata 
chromium mpris:artUrl              file:///tmp/.org.chromium.Chromium.Fihak5
chromium mpris:length              255007000
chromium mpris:trackid             '/org/chromium/MediaPlayer2/TrackList/TrackB3BA7744A05CEF02296FD074174D292B'
chromium xesam:album               This Is What It Feels Like
chromium xesam:artist              Gracie Abrams
chromium xesam:title               Hard to Sleep

Here (https://www.freedesktop.org/wiki/Specifications/mpris-spec/metadata/#xesam:url) the xesam:url field is defined as "URI: The location of the media file", but most other media players (streaming services) report the link to the track in this field, which seems like a sane thing to do in my opinion:

$ playerctl -p spotify metadata 
spotify mpris:trackid             /com/spotify/track/5flFJmhTKhO3bPxBoGxWX8
spotify mpris:length              167000000
spotify mpris:artUrl              https://i.scdn.co/image/ab67616d0000b2733a06aad5c5b8b77c9aff5ce4
spotify xesam:album               ひこうき雲
spotify xesam:albumArtist         Yumi Arai
spotify xesam:artist              Yumi Arai
spotify xesam:autoRating          0.28000000000000003
spotify xesam:discNumber          1
spotify xesam:title               紙ヒコーキ
spotify xesam:trackNumber         7
spotify xesam:url                 https://open.spotify.com/track/5flFJmhTKhO3bPxBoGxWX8

Observe spotify xesam:url https://open.spotify.com/track/5flFJmhTKhO3bPxBoGxWX8 here.

In my opinion tidal-hifi should put the contents of the custom:url field in xesam:url (as well).

Tested with v5.17.0