Efficient way - how to load dozen of ext. text in the same txt field for different fr

I have dozen of instances of the same mc on the timeline:
eg.
mc_1 (frame1)
mc_2 (frame2)
mc_3 (frame3)

Those mcs has inside dyn. text field like “my_txt”
In “my_text.text” I assign every time (for certain frame) other text.
It works, but now I need to add scrollbar component and in this case the comp. don´t work.

Exist some more efficient way how to work with the same txt field if on other frame other text needed?

I hopeYou undestand what I mean.

Regards Jan