Click (Meta) Command to run a list of commands

I need to be able to trigger multiple click commands from one command on the CLI

Let's say I have a click group

@click.group()
def cli():
    pass

@cli.command()
def a():
    print("A")

@cli.command()
def b():
    print ("B")

What functionality should I add to run an ordered list of the commands like the following?

$ python -m my_cli_module a,b
A
B

The goal is that there are shared variables which get initialized for each of my commands. The init is expensive and I'd like to run the init exactly once.