How to use the installer._apt.search_for_pkginfo_apt_pkg function in installer

def _get_backend_component(self, pkginfo):
        try:
            backend_component = self.backend_table[pkginfo]

            return backend_component
        except KeyError:
            if pkginfo.pkg_hash.startswith("a"):
                backend_component = _apt.search_for_pkginfo_apt_pkg(pkginfo)
            else:
                if self.have_flatpak:
                    backend_component = _flatpak.search_for_pkginfo_as_component(pkginfo)

            self.backend_table[pkginfo] = backend_component

            # It's possible at some point we'll refresh appstream at runtime, if so we'll
            # want to clear cached data so it can be re-fetched anew.  For now there's
            # no need. The only possible case is on-demand adding of a remote (from
            # launching a .flatpakref file), and in this case, we won't have had anything
            # cached for it to clear anyhow.

            # pkginfo.clear_cached_info()

            return backend_component