How to customize content fragment in AEM6.4

Hi Team,

We got a request to implement below customization content fragment in AEM6.4. Could you please provide your suggestion/advise on this.

1) Add a paragraph text under a text field (granite/ui/components/coral/foundation/form/textfield), which provide some key notes about the text field( like "*Note the text field value much exactly match the value set up in the xyz system...") and we don't want to use field description and it need to be a paragraph.

2) We have a dropdown in the content fragment and we need to show/hide other fields in content fragment based on the dropdown value.

Thanks

Seran.