How to Validate Input Sum Equals 100% Before Submitting an Adaptive Card in Power Automate for Teams

Hello everyone,

I'm working on a Power Automate flow where I need to collect three percentage values (W1, W2, and W3) from users via an Adaptive Card in Microsoft Teams. My main challenge is that I need to validate that the sum of these three inputs equals 100% before the user can submit the card. If the sum is not 100%, the card should prompt the user to adjust their inputs accordingly.

I'm using the Teams action "Post an Adaptive Card to a Teams channel and wait for a response" in Power Automate to generate and post this card.

The issue I'm facing is:

I cannot reference or access the inputted values within the Adaptive Card to perform the validation before submission.
I need a way to prevent the user from submitting the card unless W1 + W2 + W3 equals 100%.
Ideally, the card would display an error message or disable the "Submit" button until the validation condition is met.

I've looked into Adaptive Card expressions but haven't found a solution that allows for validating user input within the card itself before submission.

Any guidance or suggestions would be greatly appreciated!

Thank you in advance for your help.