How to do multi-threading within julia when using pyjulia

In the documentation, it says

_PyJulia cannot be used in different threads since libjulia is not thread safe. However, you can use multiple threads
within Julia. For example, start IPython by JULIA_NUM_THREADS=4 ipython and then run:

.... code ...._

Question: is there a way to enable a multi-thread Julia in a python script so that I can run it from the command line? Something like python3 call_julia.py

Where call_julia.py is a python script like below:

import julia
from julia.api import Julia

### may be something magic happen here so that imported Julia is multi-threaded?

from julia import Main
jl = Julia(compiled_modules=False)

jl.eval('include("functions_defined_in_Julia.jl")')

def julia_model(parameters):
Main.parameters = parameters
x = jl.eval("julia_model(parameters)")
return x

Any thoughts? I have read through the documentation but still got no idea how to do it, thanks!