Does Rosemary oil need to be diluted to be used on skin, and if so by how much? (With Jojoba ad a carrier)

I'd like to use it to try to help my eyebrows to grow out and to support my hair growth, but that last thing I want to do is cause damage by using it undiluted if that isn't skin safe. I have jojoba oil that I can use as a carrier, but what ratio would I need to use? Or can it be used neat?