Libreoffice Impress Outline at PDF Export

When pdf exporting a Libreoffice Impress document there seems no possibility to generate a pdf outline list of the slide titles (which would be showed in the pdf reader on the left side as as a shortcut list)

Neither seems Impress to allow generating a “Table of Content” slide with all slide titels (which would be a workaround for the missing pdf outline).

(I tried to add and use a “Heading 1” style for the slide titels, but this seems not to be possible)


same here, this is an old question but still no luck.