Load base64 encoded pdf file to fnd_lobs table in Oracle EBS

I want to load a pdf file into fnd_lobs table, the file is available in base64 encoded format in a database table. What approach can be used to load that file in the fnd_lobs table? afterwards I can use API to attach that lob to purchase order header.

In the below mentioned link the file is placed in a directory and it is loaded in fnd_lobs table, we have the file in base64 encoded string that is interfaced from fusion cloud to EBS:

https://oracleappsessentials.blogspot.com/2017/08/using-attachement-api-in-oracle-apps.html

Thanks in advance.