do you have manually triggered scenario with inputs like MS365 Power Automate ?
Power Automate can send HTTP requests to your Custom Webhook trigger.
Alternatively, you can use it to call the Make API to run the scenario.
For more information, see
Sorry, I misunderstood your question.
You can have scenario inputs in Make on the Pro subscription or above.

For more information, see https://www.make.com/en/help/scenarios/scenario-inputs