Text box default text functionality

Hi there, I was wondering in LibreOffice if there was functionality that would allow a text box on a fillable pdf form I create with LibreOffice to:
-start with default text (I can achieve this by filling in the ‘default text’ property so I have go this far);
-when I click on the box in the fillable pdf form format I want this ‘default text’ to disappear without having to manually delete it, anyone know if this is possible?
-if I was to deselect the fillable pdf form text box with no words having been typed in, can I get the ‘default text’ to reappear?