Hi Florian,
it is not directly possible, but you can use a workaround... I just used it. One problem to watch for is that the pseudo-linked frames (which will display pages of the LaTeX document) must have exactly the same size. Of course direct support for this in scribus would be excellent, but... you know. Do like this:
Create same-sized render frames (anywhere in the scribus doc) with the following content for the render code:
\def\scrPageNumber{1} % change to 2, 3, ... in every render frame
\def\scrPaperWd{$scribus_width_inch$in}
\def\scrPaperHt{$scribus_heigh_inch$in}
% you have to use absolute path (latex is run in a temp dir), see https://bugs.scribus.net/view.php?id=15332
\input /absolute/path/to/document/latex-content.tex
Create latex-content.tex (call it whatever is suitable) like this (it will be included after \scrPageNumber, \scrPageHt, \scrPageWd will have been defined by each frame)
\documentclass[...]{article}
% PAPER SIZE: set same as the render frame, leave 1mm on each side for protrusion, see https://bugs.scribus.net/view.php?id=14873
\usepackage[margin=1mm,papersize={\scrPaperWd,\drPaperHt}{geometry}
% PAGE SELECTION: output one page per frame only!!!
\usepackage[\scrPageNumber]{pagesel}
\usepackage{atbegshi} % avoid warning from atbegshi, include after pagesel: https://tex.stackexchange.com/questions/219255/atbegshi-warnings-printed-as-part-of-output
%% COLORS: if you use colored text, make sure to include luacolor (and run w/ lualatex) otherwise you end up with bad color on pages after the first page
%% see https://tex.stackexchange.com/questions/431090/how-to-discard-pages-from-pdf-output-without-affecting-text-color
\usepackage{xcolor}
\usepackage{luacolor}
% FONT AND OTHER PACKAGES
\usepackage{fontspec}
\setmainfont[...]{...}
% DOCUMENT BODY
\begin{document}
\color[cmyk]{.4,0,0,.6}
your text here
which can span several pages
where each page goes to its respective
render frame
\end{document}
Now if you want to test your document outside of scribus, create another main file, like latex-main.tex:
\def\scrPageNumber{-} % output all pages
% use some values for testing
\def\scrPaperWd{48mm}
\def\scrPaperHt{151mm}
\input latex-content.tex
HTH, Vaclav