I set up a Container Template as follows, and want to execute shell in it

but when I use label "pyenv" in freestyle job and use python, I got error message:
+ whoami
jenkins
+ python -V
python: command not found
+ pip install python-jenkins
line 17: pip: command not found
it seems the script run in "jnlp container", instead of "python container".
I searched a lot and found "container" argument could be defined in "pipeline", but how can I specify to build in certain container in freestyle job?
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