WP_HTTP_BLOCK_EXTERNAL support for automatic exchange rates

Is there any way to automatically fetch currency exchange rates with this plugin on a wordpress server with WP_HTTP_BLOCK_EXTERNAL enabled?

For security reasons, our woocommerce shop’s server has been hardened with a firewall that blocks the web server from being able to initiate connections through the OUTPUT chain. This makes it so the web server can serve requests; it cannot initiate requests.

Basically what I’d like to do is write a system-level cron job that automatically fetches currency data and writes it to a file somewhere that’s accessible to the wordpress website.

Does this plugin support a way to automatically import currency data from a file on a recurring basis (eg every hour)?