Skill installation on VENV

Hi,

I have installed Mycroft with ovos on python virtual env. I have add gui control for Homeassistant and all works. (in French version)

but i would add home assistant skill.

for add it i have read many solution and test many solution :
1- pip installation => KO
2- mycroft-msm => KO
3- osm install => KO
4- add skill.list => KO

I have search to install other skill for test example cocktail but not work.

Can you give me the solution/procedure??