Well there’s no straightforward ways to do this. The biggest problem, I think, is not how to get 300 rows of data in the right place (you can export to Sheets like David said, if you want to import something to Glide table then automate it using the thread below).
But how to get all the computed columns, if you don’t have that many computed columns then I think you can re-do the work in a not too big timespan.