everything is configurable about each zone's blips.
blip = { -- you can find more information at https://docs.fivem.net/docs/game-references/blips/
sprite = 84, -- the blip's sprite
display = 4, -- the blip's display
scale = 1.0, -- the blip's scale
colour = 1, -- the blip's colour
text = 'Zombie zone - Hard level', -- the blip's name
radius = { -- the radius data for the current blip
colour = 1, -- the radius's colour
alpha = 150 -- the radius's alpha (value between 0 and 255)
}
}