AMP support by Advanced Custom Fields (ACF). ACF for AMP allows you to view advanced custom field data in the AMP version of your site. To derive, the data requires a little integration, not all code change. This extension works perfectly well with or without the AMP for WP plugin. You can also use this only with the default AMP plugin.
This plugin is a premium add-on to the best AMP plugin for WP: AMP for WP. It is a free plugin and is required for premium plugins to work: https://pl.wordpress.org/plugins/accelerated-mobile-pages/