Input text with condition

I have this form:

If I don’t check the ‘Accepté’ button, I must write in the ‘Cause de refus’ text. If I check the ‘Accepté’ button, I don’t write in the ‘Cause de refus’ text.
How can I develop this condition in the BPMN file.

Thank you

@fatma_wings how did you create this form?

It is best to use Embedded Forms (Angular Forms) for this.

I create it by Camunda Modeler. Im not good in Angular. Hav you another way to resolve my problem?