hotswap_pcb_generator VS catchnhole

I'm guessing it's this: https://github.com/50an6xy06r6n/hotswap_pcb_generator

I've did a lot of Googling, and I saw either lots of "here's how to add a RGB strip" or "it's hard and isn't worth it" on the subject of adding RGB SMD to a custom keyboard. I've built a keyboard before, Keebio Sinc, but that one supported a single color LED. Now I was printing a small keyboard made from this ( https://github.com/50an6xy06r6n/hotswap_pcb_generator ) and it had me thinking, how hard is it to add RGB LEDs to a similar design. I have ideas in my mind of how I would go about making room for adding the SK6812 MINI-E, I honestly just have no experience with ProMicros or in what ways to connect these LEDs to a ProMicro. I know I found many examples of adding the code to control the LEDs in the config, but I wouldn't know where to begin with wiring it since mostly everyone uses custom bought PCBs or LED strips.

I am trying to get the catchnhole library to work. Its github page mentions that json import has to be enabled, which is only available in nightly builds. I installed a nightly snapshot, but I cannot find any reference on how to enable theis json import. Thanks.