A dataset of IRS 990 filings are available there. It is a big collection of XML files.
Here is an example of one chosen at random: https://pastebin.com/pzNYBZYQ
EDIT: here is the same thru propublica explorer:
https://projects.propublica.org/nonprofits/organizations/437...
which links here, which is the document I posted:
https://s3.amazonaws.com/irs-form-990/201643199349201044_pub...