I spent some time in this system and I figured a few things out.
First of all, Josie Rosa installation orbits effectively C/D twin black holes. The thing about black holes is that each of them is a gravitational lens, so if you put two of them together like we have in this system, you get a telescope. Josie Rosa is pretty far out so it's looking at something pretty distant, and it's likely not really something you can actually figure out from its position, because I don't think where it is, you'll actually get a good view through this "telescope". Also, the giant it's hanging onto has 2D orbit period and the black holes have 0.1D orbit period so you'd need to hang around for a few hours for all of this to line up. But Josie Rosa is more or less lined up with the black holes (more or less because it's not exact) - I think it's more of environmental story telling than actual mystery to solve.
However, there is an old post that if you Data Link scan the installation, and go to galaxy map while at the installation, you'll hear a signal. I did that, and I parked myself at the middle of the long section of the station, and lo and behold, the signal did appear in the galaxy map. I pulled out audacity and recorded some of it (it's continuous) and I did discover that it's actually a music sheet. I don't have the patience to decode the whole thing and figure out what song the sheet is for (if it's something recognizable), but with spectrogram settings of greyscale, 800Hz - 8000Hz, LINEAR scaling, the signal is periodic, with each part consisting of first actual music notes, and second the reference 5 lines of the music sheet. Possibly if you sit long enough you'll also find the music key.
