Won A Multi-million Scratch Ticket Just Before Divorce

I am still in shock over the win and haven't cashed it in yet. It's been a few days of wrapping my head around what to do. We currently both live in Texas. We are amicable.

I was told that I will need to disclose this ticket with him before the divorce is finalized.

Since my finances are dramatically changed, what should I expect to happen? We are filing taxes jointly. I wish there was a way to just wait till after taxes, cash it out, and split it 50/50 without a mess of paperwork and legality. Like... under the table and don't even tell the judge? Is there a way to do this?