In lxxe Psalms, titles are part of verse 1

[jk3us]

Compare

https://github.com/gratis-bible/bible/blob/split/en/lxxe/ps.xml#L230

and

https://github.com/gratis-bible/bible/blob/split/en/kjv/ps.xml#L119

In KJV, the titles of the psalms (e.g. "A Psalm of David, when he fled from Absalom his son.") are in <title> tags, but in the lxxe/Brenton version, those are just included with verse 1. The sources at https://ebible.org/eng-Brenton/ have them as titles, but not in a format as nice as these.