wix-crm-backend / getContactById () - Get the value of a customFields

Would anyone have a syntax example of how to get data from a customFields

In Back-End

import wixCrmBackend from 'wix-crm-backend';

export function myBackendFunction(contactId) {
 	return wixCrmBackend.getContactById(contactId);
}

In Front-End

let varContactId = "5b0a97da-616d-32b4-be10-e8007c20e04c" // Someone's ContactId

myBackendFunction(varContactId ) 
        .then((infocontact) => {
            console.log(infocontact)
        })

For example if you have a customFields called a company

#wix_crm_backend
#getContactById
#custom_fields