how to reformat long f-string correctly?

I have a line of code like this: 

aux_code = f'\n//!!! required values count= {len(steps_map[step["type"]]["values"])}; step\'s values count= {len(step["values"])}'

Every time I reformat code, it becomes like this (it is wrong):

aux_code = f'\n//!!! required values count= {len(
    steps_map[step["type"]]["values"])}; step\'s values count= {len(step["values"])}'

how can I fix this format issue ?