Lookup in a formula expression

Hi,

Imagine I have a table accessible locally in BRFPlus

I can define a lookup expressions to get a values out of this table and use them in a formula expresion

result = lookup_value_for_key1 + lookup_value_for_key2

But would it be possible to create a formula expression working like this?

result = lookup_value(key1) + lookup_value(key2)

is it possible?

cheers,

Marcin