Fetch data from another app and use in a formula

Fetch data from another app and use in a formula

Hi,

I have a app named "skills". I also have a app named "age". At least  I have a app named "pointer".

In pointer I made two lookups.One from app Skills and another from app Age.

What I need is make a formula who combine the field value "specialist" in Skills, the field value "age" and combine in a formula in pointer -  input.profile = input.skills + "" + "\" + " " + input.age. 

The input.skills are from app skills. The other is from another app. I can't use the default value for the fields (the ID), but the value from eacjh one.

Could you help me?

thanks in advance,

regards from brazil