Is this even possible for the midterms?

"With provisional ballots still being counted, Donald Trump claims the GOP held the House and alleges Democratic fraud. While Republican lawyers sue to stop the count, Attorney General Pam Bondi and FBI Director Kash Patel use federal authority to threaten local officials and spread fraud rumors. Despite Democrats leading by slim margins, conservative media amplifies claims of treason.

The situation escalates when Trump claims a county recorder agreed to hand over voting machines to the Department of Homeland Security. Though a judge and Justice Elena Kagan attempt to block the move, Marines seize the machines and ballots. Patel declares the Republican candidates the winners, effectively breaking the chain of custody. Following local protests, Trump invokes the Insurrection Act to declare martial law. Ultimately, House Republicans reject Arizona’s official Democratic certification and seat the GOP candidates instead."

Would Trump throw the election into chaos in order to claim victory.

I think so.