Ability to edit 'Repeating Unit' as text in the polybuilder

Is your feature request related to a problem? Please describe.
I want to be able to change the number of repeating unit in already built polymer.
For example:
-> I built the following repeating unit to be 2 unit long.
[4DGlcpa1-4DGalpa1-]<2>OH
-> I want to go back and make the same repeating unit, 5 unit long as following.
[4DGlcpa1-4DGalpa1-]<5>OH
Here I need rebuild the repeating unit again and change the number of repeating unit, which feels so repititive.

Describe the solution you'd like
As this can be already achieved by using build via text tool. I will highly appreciate the ability to modify the text within 'repeating unit' itself.

Describe alternatives you've considered

Additional context
I recorded a video here: https://jam.dev/c/bcc7a8d5-306d-4c8f-952d-54dd6041abb2