I can… like… make an extension… for that… if you want… (only one color at a time is crazy! I’ve never used that extension.)
It’s just a normal function in JavaScript. The only problem is that the input is a buffer, but I could make some rudimentary blocks that let you input an array instead, or set the r, g, and b values of a certain color individually. Just give me, like, 4 weeks, because I’m not gonna code this while I’m at near 0 internet and only have my phone… (side note plz do weekly art challenge again pretty please with a red pixel on top 
)