Playall setting for Google Slides Element

Currently, the Google Slides element allows setting a display time for each slide, but there is no way to have the element hold the screen for the whole presentation.

Example

If the Google Slides Presentation currently has 2 pages, for example, setting each page to 15 seconds requires that in the Playlist, the Layout is set to 30 seconds. If a 3rd page is added, it will never be visible without the element or playlist being manually edited.