Possibility to not submit a form component variable

[volodymyr-melnykc]

Is your feature request related to a problem? Please describe.

The form output lists variables for all components added to a form and those variables will be available in the process.

This is not always needed. In some cases, components are added to define an intermediate state or make computations but are not required for submission. E.g., an expression component that computes a value, an input field displayed conditionally, or a read-only input field.

Describe the solution you'd like

The possibility to indicate that a form's component variable (e.g, an expression) should not be submitted on form submission.

Describe alternatives you've considered

Keep it as it is.

Additional context