Use ENUM in array of objects

Is it possible to setup an ARRAY column with objects/JSON on a TABLE, forcing a parameter of the objects in the ARRAY to adhere to an ENUM, while keeping that object parameter unique? Data examples: ENUM val1, val2, val3 [{p1: val1, p2: 'something'}, {p1: val2, p2: 'something'}] <-- valid [{p1: val1, p2: 'something'}, {p1: val4, p2: 'something'}] <-- not valid, val4 not an ENUM value [{p1: val1, p2: 'something'}, {p1: val1, p2: 'something else'}] <-- not valid, p1 not unique If it is possible, using PostgreSQL and sequelize, how would I go about it, setting up the column?