See the documentation of CondaPkg.jl:
julia> using CondaPkg
julia> # now press ] to enter the Pkg REPL
pkg> conda status # see what we have installed
pkg> conda add python perl # adds conda packages
pkg> conda pip_add build # adds pip packages
pkg> conda rm perl # removes conda packages
pkg> conda run python --version # runs the given command in the conda environment
pkg> conda update # update conda and pip installed packages
In particular note the conda pip_add build command to help you load Python packages installed via pip.
In particular, see