How would I save a specific Leaderstat value via DataStore?

local PlayerJoined_DataStore =
game:GetService('DataStoreService'):GetDataStore('JoinedTimes')

game.Players.PlayerAdded:connect(function(Player)
	local Joined =
	PlayerJoined_DataStore:GetAsync(tostring(Player.UserId))
	local Stats = Instance.new('Folder',Player)
	Stats.Name = 'leaderstats'
	local JoinStat = Instance.new('NumberValue',Stats)
	JoinStat.Name = 'Joined'
	
if Joined ~= nil or Joined == 0 then
	JoinStat.Value = Joined
	print("Loaded stats for "..Player.Name)
	PlayerJoined_DataStore:SetAsync(tostring(Player.UserId), Joined + 1)
	--[[ I would like to GetAsync data for the player kill value.

	I have already made a leaderboard script with the value I want to save,
	the directory of the value I want to save is game.Players.PLRNAME.leaderstats.Kills.Value
	--]]
else
		PlayerJoined_DataStore:SetAsync(tonumber(Player.UserId), 1)
		warn("Failed to load stats for"..Player.Name)
	end
end)

Ignore the "local VALUE =" with an empty definition of the line, look below the line to see what I defined the VALUE to be.

I would imagine that all you need to do is create a new data store:

local kills_ds = game:GetService('DataStoreService'):GetDataStore('Kills')
game.Players.PlayerRemoving:Connect(function(player)
    kills_ds:SetAsync(player.UserId,player.leaderstats.Kills.Value)
end