https://wccftech.com/pinnacle-station-dlc-comes-to-mass-effect-legendary-edition-with-a-mod/

The ME3Tweaks group of modders has managed what BioWare couldn't, successfully porting the Pinnacle Station DLC of the first Mass Effect to the Legendary Edition. How did they do that? Well, the lengthy technical explanation is available here, but the short version of it is that BioWare had lost the original source code. The modders, on the other hand, were able to use the Legendary Explorer toolkit which does not need the source code, so it was easier for them than for the game's developers.

The Pinnacle Station DLC mod, only available on PC, needs to be installed through the ME3Tweaks Mod Manager. It does come with quite a few caveats, such as currently only supporting English audio and requiring stronger graphics cards than the base game (because the lighting is calculated in runtime, not prebaked), with the NVIDIA RTX 1070/AMD RADEON RX 580 recommended for 1080p@60FPS.