There’s no way to magically extract and migrate articles from within a JPA backup file directly into WordPress.
You can use Akeeba eXtract Wizard to extract the database file from the JPA file and then you have access to the article HTML via a text editor but you’ll need a working copy of WordPress to be able to import the articles by whichever method you choose.
You could set up a local development environment using WAMP, MAMP or LAMP etc but the simplest and quickest course of action is probably to purchase a web hosting plan and work on this on-line. A web hosting plan costs very little and you can pay by the month and cancel it after you no longer need it if you have no further use.