How do merge/combine selected subtitle, with next or previous available on Timeline?

If there is a subtitle line having more and more words in timeline, we can split/divide that line in subtitle editing section, with the help of scissor/eraser tool but,
Is there a way to merge/combine two or more short subtitle words/line with next or previous lines?
If yes, then explain please.
If not, add this functionality to the Kdenlive Video Editor.
See the image.
Thank You