I'm familiar with Doterra essential oils, and from what I understand, they are highly concentrated, and usually mixed with fractionated coconut oil as a base for applying to the skin.
As long as the one you are using are marked for internal consumption, I would give them a try on a very small batch, or by testing on a pint of light beer just to get an idea of the flavor additions, strengths & other properties.
In some cases, it may be easier to soak 3-5 sticks of cinnamon in a secondary, then trying to measure 1.32 drops of concentrated cinnamon essential oils. But, I would definitely explore the topic a bit and try it out. Let us know how it goes!