cc.Label - Kerning / Letter spacing

Hi,

Is there any way to adjust a cc.Label’s Kerning or Letter spacing?

I found something about it on cocos-2dx called:
setAdditionalKerning
http://doc.zengrong.net/cocos/3.2/db/de4/classcocos2d_1_1_label.html#a482a23f533f1b9bb0172627de3b3ebc9

But how do you do this in Cocos Creator?

Thank you for your help!