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Yes, you can bring your herbs indoors to grow during the winter months.

Make sure they have plenty of sunlight. Find the sunniest spot you can for your plants to grow well.
You may want to set up a grow light for the plants.
Here is a link with more information.

https://www.gardeningknowhow.com/edible/herbs/hgen/growing-herbs-indoors.htm

These seem to only be hardy down to zone 8. If you are outside this then it will be common for them to die. You can try to mulch them to help, or even taking a cutting or growing a plant inside. If you kept this plant in container, you would be able to bring it inside during the winter.

Here is an article for more information: https://www.gardeningknowhow.com/edible/herbs/stevia/stevia-plants-in-winter.htm

Check local garden centers, Do a Google search and try Ebay and Etsy!

https://www.gardeningknowhow.com/edible/herbs/stevia/stevia-plant-care.htm
https://www.gardeningknowhow.com/edible/herbs/nettle/stinging-nettle-greens.htm

This article covers growing Stevia!
https://www.gardeningknowhow.com/edible/herbs/stevia/stevia-plant-care.htm

You could plant it according to how you will use it, how often you will harvest, and where it is convenient for your access.

For example, if your other herbs are near the back door for easy access, I would put it there. (I saw the marjoram and thyme companions, too.)

You are on the borderline hardiness zone, so you may want to plant it in a pot and bring it inside for the winter. Here is more info:

https://www.gardeningknowhow.com/edible/herbs/stevia/stevia-plant-care.htm