Is there any way to copy paste keyframes to the start and end of a Graphic's vector motion?

[HellPillars]

I'm trying to make a subtitle animation where I'm changing the scale at the start and end of text, but I have yet to find a way to copy and paste these keyframes as I'd usually do with presets or copy-pasting attributes. 

I thought  I found a way by scaling attribute times while pasting attributes, but that either creates longer animation that I do not want or outright excludes the animation because the length of the subtitle is too short.

I'm curious to know if there's any workaround to this, so that my keyframes could have the same spacing between keyframes at the start and end of the subtitles.

Thanks for taking the time to reply.