No-Churn Mint-Chip Ice Cream

In a large bowl, stir together condensed milk, peppermint extract, and creme de menthe. In another bowl, beat heavy cream with salt until stiff peaks form. Gently fold into milk mixture, in two batches, until no streaks are left. Fold in chocolate. Transfer to a loaf pan; freeze for at least 6 hours and up to 1 month.