I want to share topics on social media, but I can't see a way of setting a default og:image for topics. I am using Yoast SEO and I can set the og:image for each forum. However, these are not then carried through to the topics inside that forum - the topics revert to the single, site default image, which is often not related or appropriate for the topic.
Any suggestions about how this can be achieved? It would be really useful and avoid having to set an image for each and every topic.