🚀 go-pugleaf

Dear all,
another day, another weird problem.
I have a drawing in Frame which contains a lot of boxes and each box contains some text in it. Text in each box is placed in an embedded text box, to make future editions simpler.
Now, I need to center the text vertically and horizontally. Horizontal alignment is a piece of cake. Vertical one is problematic. I did search the forum and help form frame but came up only with vertical centering for a table, which I cannot use in this case. Any thoughts, ideas, comments on how to do it ?
Doing that by hand (aligning text box to the outside graphical box) for each box is strenuous ...
Thank You for the time
Marek