how to set and get EAV attribute value for customer object

hello everyone i have already an EAV attribute added by patch data to the customer entity, so I need now to get that default value of the field and also set another value to it, can anyone help please for how to get and set the value of EAV attribute by object ?

i have aleady getting the customer object by this

$objectManager = MagentoFrameworkAppObjectManager::getInstance();
        $customerFactory = $objectManager->get('MagentoCustomerModelCustomerFactory')->create();

        $customer = $customerFactory->load($this->customerSession->getCustomer()->getId());