Fundraiseup currently does not export disputes in the donation export template. The only way we can get disputes is by manually exporting in the dashboard as explained by Qasim here:
If this is so, we would probably need a frontend to upload this file inorder to import into Civi.
Slack conversation here: https://wikimedia.slack.com/archives/C05PB09G8VB/p1695694591448459?thread_ts=1695150475.570239&cid=C05PB09G8VB