Hi DannyBerg!
There is an option to insert it in the cell itself but it is done manually (like you have to draw it like a rectangular shape).
To add a check box, click the Developer tab, click Insert, and under Form Controls, or active X control> click the check box.
Click in the cell where you want to add the check box, draw a rectangular shape in the cell and the check box will appear.
To edit the size, Right-click on the check box and click on the format control> click on the sidebar, then edit the size to what you want.
Tips: You can edit the height and width of the cells to make the Check box fit in more perfectly.
References: https://support.microsoft.com/office/9f201e46-8f6b-4a9d-a320-f44b28088cb0
Kind Regards, Shakiru