Decision Object output calculated value

I need return the Decision output as a calculated value instead of a static value, is it possible to use variables and expression in Decision output?

E.g.:- based on certain condition I want to return Decision output as 10 % FeeAmount + Surcharge + Tax.

I have to execute these decision as part a another Process Model and use the Decision results in that process model, I can return a process model from decision but process models returned from Decision can only executed asynchronously and I can not use the Decision Process Model results in Parent Process Model.

If this is not possible with Decision Object, what is other alternatives we have with Appian?

I want to build rule engine where it takes inputs and based on certain conditions returns one or more calculated values

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