LabelTTF truncates text along top

LabelTTF truncates text along top

Hi. I faced some weird problem with displaying symbols with umlauts (a kind of checkmark above the symbol)
This is how it looks
This is how it should look like.

Custom size is set to true. Vertical align is set to middle. Element height is set to have additional padding, in Cocos Studio it looks good without clipping.

What can I do?
I believe, setLineHeight function could help. But neither cc.LabelTTF nor ccui.Text support this function.

Create BMFont from TTF at runtime

I found acceptable workaround.
Look here