Align baselines of 2 fields

[Knapp Martin]

I have a user customizable stack that has a label field, then just to the right of that a field with user content. The user is able to customize the font and size of both the label field and the content field individually. Both fields are just 1 line. Is there a way to calculate where the baselines of these 2 fields are so that I can align them automatically (without user interaction)? 

Thanks,
Marty