@sedgequeen is correct. iNat does not suggest anything below the species level.
Subspecies can be a contentious topic and the same discussions tend to happen over and over each time a thread about subspecies is started. So anyone curious to know more about different stances on subspecies designations should search the many existing threads.
To name just a few:
Thoughts on Subspecies?
Subspecies. How useful are they?
Improve support / workflow for subspecies?
Question Regarding Subspecies Identification