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$SU(2)$ gauge fields can generate large gravitational waves during inflation,if they are coupled to an axion which can be either the inflaton or a spectatorfield. The shape of the produced tensor power spectrum $\mathcal{P}_h$ dependson the form of the axion potential. We derive analytic expressions and providegeneral templates for $\mathcal{P}_h$ for various types of the spectator axionpotential. Furthermore, we explore the detectability of the oscillatoryfeature, which is present in $\mathcal{P}_h$ in the case of an axion monodromymodel, by possible future CMB B-mode polarization observations.

Tensor Spectra Templates for Axion-Gauge Fields Dynamics during Inflation