Link to display a text when we hover on it

Hi team,

I have a text to display as "Completed with Justification" and it should display as a link and on hovering over on the link, the comments saved in justification field should display. 

Can someone help me how to achieve this. I tried as below but it didnt work.

a!richTextDisplayField(
              value: a!richTextItem(
                text: "PLL Completed with Justification",
                link: a!safeLink(
                  label: "PLL Completed with Justification",
                  uri: ri!RGRACSLBL_LabelChangeCountry['recordType!{d1de8e89-4208-44d3-bb27-0306902c0671}RGRACSLBL Label Change Country.fields.{7ac1eaa1-1093-44b1-a996-7f1610dcc510}justificationForClosure']
                ),
                style: "STRONG",
                size: "STANDARD"
              )
            ),