I’ve always done as Tim suggested.
However, I just ran a quick trial. I went here
Vertical Font Generator to generate font Vertically (codebeautify.org)
and created some vertical text. Downloaded it (.txt file) and then converted it to SVG at convertio.com. When I imported the SVG, it came in as individual text boxes as if I had created each one individually. They were perfectly stacked. If for any reason that was desirable, it would be faster than creating a whole bunch of individual text boxes from scratch.