--- default.tex	2023-03-10 21:20:49.332547333 +0100
+++ langtest_template.tex	2023-03-10 20:55:38.286983982 +0100
@@ -362,6 +362,9 @@
 $for(babel-otherlangs)$
 \babelprovide[import]{$babel-otherlangs$}
 $endfor$
+$for(babelfonts)$
+\babelfont[$babelfonts.language$]{rm}{$babelfonts.font$}
+$endfor$
 % get rid of language-specific shorthands (see #6817):
 \let\LanguageShortHands\languageshorthands
 \def\languageshorthands#1{}