Absolutely, I'm used to set it up as following. First you create an entity, in this case named "Bearer" with token as string attribute. Than you retrieve the bearer with a seperate call first, I normally use a sub microflow because I have to re-use it throughout the app usually. After you've retrieved the bearer token you can call the rest service:
In this call you setup the custom headers of which one is the bearertoken:
Now it should work. Hope this helps you further.
Please try this