I've just used TG from NRT to LAX. At NRT Terminal 2, lounges assigned to TG pax were JAL's one.
Since JAL's lounge I went was a little crowded I moved over to NH's Club ANA lounge. At there I was told that JAL's lounges are assigned to TG pax, which means, there are some pax support such as announcement of start of boarding etc in the assigned lounges. It was ok to use NH's, but they told me they can't do announcement for TG flights.
It was quite fine for me and I enjoyed Club ANA lounge.