Grouping subtitles for long sentences

When I practice a long sentence on Netflix, I have to push Q and SpaceBar very often for a long sentence including many subtitles.
But as you know, many mobile apps for learning via YouTube like MediaDict or DingulTube, etc. group them to one unit of repeating practice by automatic or by custom as checking checkbox, etc.
I think LLN,LLY should adopt this fuction to help us practice repeatedly a long sentence with many subtitles with only s or down arrow key on Q option.