How can I pass a variable from Lightning Flow to LWC?

The below link have enough information about embedding a LWC in Lightning flow but nothing about passing a variable value to LWC.

https://unofficialsf.com/adding-lightning-web-components-to-flow-screens/

For example:- I have a variable in Lightning Flow called 'NewRecord'. The below LWC .js not fetching the value from Flow.

import { LightningElement, api } from 'lwc';
import { NavigationMixin } from 'lightning/navigation';

export default class TakeMeToClonedOrder extends NavigationMixin(LightningElement) {

@api NewRecord;
@api Message;

navigateToOrder() {
    this[NavigationMixin.Navigate]({
         type: 'standard__recordPage',
            attributes: {
                recordId: this.NewRecord,
                objectApiName: 'Order',
                actionName: 'view'
            }
        });
    }
}