It's possible to add a custom label to a behave scenario. Simply apply
@allure.label.<name>:<value>
tag to your scenario, e.g.:
Feature: Allure label for behave tests
@allure.label.author:John-Doe
Scenario: Scenario marked with an author label
Given noop
Note, that neither the name nor the value of a label, added that way, may contain a whitespace character.