I’m a developer working to build a newsletter system using this plugin and there are some layout options that we cannot accomplish using the pre-defined blocks. I was able to add blocks to the plugin simply by adde them into emails/tnp-composer/blocks folder. But would like to do this the ‘proper’ way so plugin updates don’t overwrite our changes. Is there a wp filter or hook that allows this? Maybe a theme or uploads folder that checks for blocks?