You can evidence it on your CV as a side project that you’ve worked on, even add it to a portfolio/Git repo and reference it - employers really like seeing content like that![]()
Exactly this. Showing you do things outside work, even if the projects seem overrly nerdy/weird can set you apart from the bunch.
It shows you're motivated to learn, not just sitting at home watching Jeremy Kyle with a can of special every day after work.
Eventually you'll find these learnings can be applied at work in some way, maybe a specific project pops up and you're perfect for it.