Make Creeper Farms Available In Minecraft Bedrock

I've been wanting gunpowder to make firework rockets to boost my elytra. So far, I've had to make some classic mob farms to get gunpowder, and witch farms are just too hard to make. The rates for my mob farms aren't that great. I also believe that Creeper farms don't work in Minecraft Bedrock. I've been watching many famous Minecraft youtubers and wondered how they got so many firework rockets, and it turns out that they had creeper farms all along. If creeper farms are never going to be available in Minecraft Bedrock, then at least make sure that Java players can't make huge creeper farms.