As a Roblox developer, it is currently impossible to report items that break the ToS in the universal app. There is no clearly visible Report Abuse button, the only item that comes up in the dropdown is Favorite, and if you wanted to report it from the web, there is no share button to view it on the web to report it.
universal app dropdown
website dropdown
If Roblox is able to address this issue, it would improve my development experience because assets which contain policy violating content could be flagged, allowing for players on mobile and console to have an opportunity to ensure that the Roblox Catalog can be a safe and inclusive experience on all devices. This would also impact games that include catalog items, as there would be less policy violating items in them as users could flag ones that are policy violating on the avatar editor/marketplace page.