You shouldn’t directly file a complaint against her because the police might not believe you.
Try to convince her that all your property will ultimately go to her. But, it’s not the right time to give her the property. And she shouldn’t only worry about the property. Make her understand that filing a false complaint will not benefit you or her.
Try to involve both families in this matter. Inform your parents about this. And discuss this matter with your in-laws. Ask them to make her stop doing this.
In the end, if nothing works out. Start collecting evidence against your wife. Record that conversation, when she tries to threaten you. So that you can prove your innocence later.
After that, you can file an FIR against your wife for a false 498A complaint. You can also file an FIR against your wife for blackmailing or filing a false 498A case against you.