Adding HTML id attribute option (or extraAttributes()) to Navigation Items and Relation Manager Tabs

[pa2codes]

It would be helpful for Users working with solutions like Usetiful, or other Product Onboarding Tools, to be able to select Navigation Items and Relation Manager Tabs via HTML id attribute (instead of messing around with CSS nth-child).

Could you please add this option?, or even better if you could add your extraAttributes() method that is already existent for Table, Form, etc.

Thank you