don't have the hardware to test, but at the moment luakit is not build on aarch64 because luajit is not available for that arch (see lang/luajit ONLY_FOR_ARCHS). Removing it from the list should make the package available at least.
ok? Index: Makefile =================================================================== RCS file: /home/cvs/ports/www/luakit/Makefile,v retrieving revision 1.38 diff -u -p -r1.38 Makefile --- Makefile 9 Nov 2022 18:18:35 -0000 1.38 +++ Makefile 8 Jan 2023 13:08:00 -0000 @@ -27,7 +27,6 @@ WANTLIB += soup-2.4 sqlite3 webkit2gtk-4 # luajit archs .if ${MACHINE_ARCH} == "arm" \ - || ${MACHINE_ARCH} == "aarch64" \ || ${MACHINE_ARCH} == "amd64" \ || ${MACHINE_ARCH} == "i386" \ || ${MACHINE_ARCH} == "powerpc"