How difficult would it be for a noob to "inject" code from one ROM into another?

Basically, I've been experimenting with many ROMs but never doing any developing myself.

I can't find one that fits me, so I'm wondering how difficult is it to do the following:

Xiaomi stock MIUI ROMs, even Pie versions, don't have colored music notifications and album art as background. AOSP ROMs have other issues, so how hard (if possible at all), would it be to manually "inject" that feature into a MIUI ROM?

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