remery on "[Plugin: WP Job Manager] Apply Button - How to Link Directly to External URL"

I've aready tried this code (but got a syntax error)
https://wpjobmanager.com/document/customising-job-application-process/#section-5

Do you have updated instructions on how to link the Apply Button to the employer's exteal URL (for the instances where exteal apply url was entered by the employer)?

https://wordpress.org/plugins/wp-job-manager/

Seems on this - the instructions are using the approach of template overrides. I'd rather use filters. Can you provide similar code for this but using filters instead?