/usr/share/xdg-desktop-portal/portals/gnome-shell.portal is in gnome-shell 3.28.1-0ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | [portal]
DBusName=org.freedesktop.impl.portal.desktop.gnome
Interfaces=org.freedesktop.impl.portal.Access
UseIn=gnome
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