I think I’ve figured it out. It’s not possible to do in a Docker container on Jetson because the L4T-Base Docker will actually link to the host libraries. In my case, the host Jetson version is R35.3, so the new property are absent in those libraries “within” the container.
Presumably, running the rootfs in l4t-base:35.4.1 (including the install of nvidia-l4t-gstreamer) natively on the Jetson will yield the correct versions of packages, but I will test that later.