Feature Request: Vertical Spacer for imported pages

[wannkunstbeikor]

Is your feature request related to a problem? Please describe.
Currently, when using the Vertical Spacer tool on a document, it will move the whole page of an imported pdf. For example, when having a document which has a couple of tasks, it would be nice to allow for spacing after each task, so you have some space to write your answer.

Describe the solution you'd like
A setting for the Vertical Spacer tool to create space even inside imported pages.

Describe alternatives you've considered
Cant think of any alternatives atm.

Additional context

[Doublonmousse]

Also discussed on #1432 (but there was no created issue from this).