Don't bother doing that. From firmware 2.2.0, the series information is supported. What you show is roughly the format used. They are still tweaking it. 2.3.2 has the format you have except the series info grey.
If you want to keep trying, the things I can think of are:
- <br> or <br />
I don't expect any of these to work as there are too many things processing the title. If you edited the database directly, one of these might work.