Learn function?

It's possible, but you can't save it into the configuration. Meaning you would have to learn the CCs every time you boot Grid.

Would you happen to have an example config on the cloud that one might be able to dissect, learn and use…?

Not really, but I could just make one tomorrow.

I made some very basic mute groups, but it would take me a bunch of time to make this into a real config.

The gist of it is to create an array that stores mute group information which then you can fill and read with button presses.

It's made of 3 parts (using a tek2 so only buttons 0-7 are used here):

group = {} --creates the array
for i = 1, 8 do
    group[i] = {}
    for j = 1, 8 do
        group[i][j] = 0
    end
end

add_to_group = function(num, cc) --adds the pressed button to the mute group
    for i = 0, 7 do
        if element[i]:button_value() > 0 and i ~= num then
            print(i .. " " .. num)
            group[i + 1][num + 1] = cc
            print(group[i + 1][num + 1])
        end
    end
end

The above are on system init and I call the functions like so on each button:

if self:button_state() > 0 then
    midi_send(ch, 176, note, val) --sending out its own mute
    add_to_group(num, note)
    for i = 1, 8 do --sending out the mutes of te mute group
        if group[num + 1][i] > 0 then
            midi_send(ch, 176, group[num + 1][i], val)
        end
    end
else
end

Of course this implementation has a billion problems, it doesn't differentiate between multiple buttons being pressed and trying to add to a mute group.

It could be made into a config, but it would need an idea for implementation.