When installing a ZABBIX server independent from Oracle RDBMS (not on a single server) - you will face the inconvenience of deploying the Zabbix database and the offered SQL files for creating an Oracle schema which comes with data and image data that is need to copy all images to the Oracle server fileystem (../misc/images/png_modern/* .png) to run this procedure later which loads the contents to the BLOB field from the filesystem files.
Instead I suggest loading the contents of the BLOB fields from the CBLOB (created from the BASE64 string that contains the PNG image data).
Or then create a column with text information (CLOB, VARCHAR2) which contains only BASE64 content, which can later be converted in the Zabbix UI using PHP to the displayed image.
This is just to reduce the inconvenience and time saving. Even more a such a thing already exists in MySQL and PGSQL Zabbix provided source SQL files (images.sql) - and that is only natural