qt_add_translations has no way of returning the automatically determined .ts file paths

cmake_minimum_required(VERSION 3.24)

project(untitled2 VERSION 0.1 LANGUAGES CXX)

set(CMAKE_CXX_STANDARD 17)
set(CMAKE_CXX_STANDARD_REQUIRED ON)

find_package(Qt6 REQUIRED COMPONENTS Widgets LinguistTools)
qt_standard_project_setup(I18N_TRANSLATED_LANGUAGES de)

set(PROJECT_SOURCES
        main.cpp
        mainwindow.cpp
        mainwindow.h
        mainwindow.ui
)


qt_add_executable(untitled2
       ${PROJECT_SOURCES}
)

target_link_libraries(untitled2 PRIVATE Qt6::Widgets)

qt_add_translations(untitled2)

qt_add_translations(untitled2 TS_FILES_OUTPUT_VARIABLE ts_files)
target_sources(untitled2 PRIVATE ${ts_files})
set_source_files_properties(${ts_files} PROPERTIES HEADER_FILE_ONLY ON)
source_group(Translations REGULAR_EXPRESSION "\\.ts$")