@nathanwoulfe is this still alive https://github.com/nathanwoulfe/NestingContently ? the clients of my latest 2 Umbraco projects (v10 and v11) are asking for this with the new grid editor I see it has support for the Block List so porting would seem doable. also spotted this post to possible achieve it through settings https://archive.24days.in/umbraco-cms/2021/advanced-blocklist-editor/