Here's discord.py's solution, should work here as well https://github.com/Rapptz/discord.py/issues/7823
#How can I create a context menu command in cog?
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Discord.py isn’t Pycord for a reason. Please don’t recommend stuff from discord.py as it isn’t our library.
If you want to give help for discord.py go to their server
discord.gg/dpy
Understood, but also note this has been open since May, minus well throw downstream at the wall and see what sticks 
How can I create a context menu command in cog?
@user_command or @message_command