Needed to enter Arabi characters

We have Oracle database 19c(19.6.0.0.0) on ODA x8-2. We need to enter Arabi characters in some columns in a table. When I entered it shown as below.

create table mystation (eng_name varchar2(30),ar_name varchar2(30));

insert into mystation values('Ghalilah Station','محطة غليلة');

SQL> select * from mystation;

ENG_NAME AR_NAME

------------------------------ ------------------------------------------------------------

Ghalilah Station ???????? ??????????

- Jan