By default, the topic list in NodeBB shows how many votes the initial post of the topic got. This plugin modifies this behaviour so that the counter shows the total of all posts in a topic.
This is heavily based on code @barisusakli published on NodeBB Community Forum - just slightly modified and packaged into a plugin
Just install via ACP plugins page, or manually using npm (or any other compatible package manager)
npm install nodebb-plugin-total-vote-count