Essential oils for the chakras
There are different ways of using essential oils at Subtle level. You can use your imagination and be creative with your oils.
What matters is your intent, each time you use Essential oils, for spiritual purposes, begin with a clear idea, of what you aim to achieve, and how you want the oil to help you.
Invoke the help of the plant and its spirit guardian ( Deva) and let the plant know. Why you need its help.
Do not forget to thank the plant afterwards. If you do this with intention,
The method you use is secondary.