No, it is not possible to make ice in a microwave without freezing the water first. A microwave oven is designed to cook or heat food items by emitting microwave radiation that excites the water molecules present in the food. This excitation causes the water molecules to vibrate, generating heat that cooks or reheats the food.
To make ice, you need to freeze water, which is a process of lowering the temperature of the water below its freezing point until it solidifies into ice. The microwave oven cannot lower the temperature of water; instead, it adds energy to it, which would have the opposite effect of melting the ice if it were already frozen.
If you put water in a microwave and run it, the water will heat up, and if you continue heating it for a long time, it may even boil and evaporate. But it will not turn into ice.
To make ice, you should place the water in a container and put it in a freezer until it reaches its freezing point and solidifies into ice. This is the conventional and only practical way to make ice using water.