If you use TurboTax Business, then you do need to to mail the return with attachments. There may be other tax software that allow this. I know that Lacerte allows this but this software isn't available to the public. It's only available to tax preparation firms that have unique IRS electronic tax filing numbers.
For the explanations, You can list the company's information, the stock exchange, the basis of the stocks as of December 31,2024, and when purchased.