[NTG-context] short last line

Hi, looking for a solution to avoid short snippets in a paragraph's last line I found lefthyphenmin/righthyphenmin. But as this affects all hyphenations it is not useful. Is there also a command that only cares for the last line of a paragraph, controlling that this last line should consist of e.g. at least 5 characters (all in all, or at least righthyphenmin 4 characters)? Steffen