ConvertFrom-SourceTable | source table or markdown table | Grid library

I have formatted text files from other sources; I can't control those sources or ask them to generate a more sensible-for-my-purposes format like CSV. I can look at the header lines of the files to determine the column widths (and names, but they're not at issue here). Once I've done that, I'll have an array of widths. I'd like to be able to split subsequent lines in that file based on the widths I've determined from the header.

Obviously, I can loop through the array of widths, and bite off the initial substring of the appropriate length, but I'm hoping there's a more efficient way - for example, if I wanted to use fixed-width columns, I could just use -split "(\w{$foo})", where $foo is the variable that contains the width of the column.

Is there, in fact, a more efficient way of doing this?

Example data: