Have you seen the approach described here? https://forum.ghost.org/t/add-dropdowns-to-main-menu-through-the-site-admin-copy-paste-into-site-header-footer-injections . Odds are pretty good it’ll work ok on Solo as-is, but if you try it and it doesn’t, please post again describing the problem. (Ideally with your site’s URL included in the post.) You might also want to specify if you can use a solution that requires editing the theme, or whether you need a code-injection-only solution - see that link for more details.
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