Size of flowed text could be adjusted by:

Change 2d rectangle size.

Or change text size,

Or ...

Ratio of height to width may also change, unless...

- Brian

As Brian wrote it, I explain the theory to be easy understood.

Next you can tune your process as Brian wrote it if you want a better result by modifying your source or/and target surfaces.

Thank you all. I will try it tomorrow.

My preminilary result

Very good result!

Can alignment of text be slightly changed by moving and/or slightly rotating base surface?

I didn´t try it.