Hi Prashanth,
You can create another attribute, and make it calculated, and in the microflow you can set the value something like:
$entity/attribute1 + $entity/attribute2
And this way, you will be able to see it and get your requirement,
Hope it helps!
Use a Data Grid to display and enter the values.Each row in the Data Grid represents an object where you will input two values that you want to add together.
Create a microflow that will perform the addition of the two values for each object.This microflow will also update the object with the result of the addition.
Use a List View to display the updated objects, including the result of the addition.