I'm trying to install python 3.7 env for miniconda on my raspberry pi 4 model B.

But when I'm doing conda install python 3.7
I get  Error: No packages found in current Linux-armv7l channels matching: 3.7.
how can I install python 3.7 in some way on that miniconda?
You might want to try with this command : conda install -c anaconda python=3.7
Tell us if this works
How to install python 3.7 on miniconda