Where is saved the Preference for "Write XMP IDs to Files on Import"?

Hello,

In a Jsx, I test if the "CreateLayerMarkersFromFootageXMP" is activated in the AE preferences with:

app.preferences.getPrefAsBool( "Metadata", "CreateLayerMarkersFromFootageXMP" );

But I cannot do the same for this one:

"Write XMP IDs to Files on Import", which is also in the Preference Panel, but not saved in the Preference files I think.

Or if it's saved in, where? And how can I check it in ExtendedScript?

Thanks.