No. std::endl isn’t a newline constant. It’s a manipulator which, in addition to inserting a newline, also flushes the stream.
If you just want to add a newline, you’re supposed to just insert a '\n'. And if you just want to add a tab, you just insert a '\t'. There’s no std::tab or anything because inserting a tab plus flushing the stream is not exactly a common operation.