None of the templates have chart as an option, but in the Play Store it stated you can do make charts. Where or how do I make a chart with a particular number of rows, etc?
If there was any, it should have been under Insert menu which does not have Charts currently
There is no option to create charts in Microsoft Word. Without any Office 365 subscription, Office for free - can render if you have a file which has customized chart (which has been created earlier using Microsoft Word on PC). Basic operations like Copy,Paste and delete works on charts. See screenshot for more understanding
You can however use Microsoft Excel for android to create Charts.
About Playstore desciption
Microsoft has a unusual way of putting things about the apps in Google Play.
If you see Microsoft Word and Microsoft Excel Google play links and scroll down to the
What's New section
You'll see that they are literally identical and talks about the other i.e in Microsoft Word page they have mentioned about Excel's new features and in Microsoft Excel page they have mentioned about Word's new features too.
Office 365 subscription
Premium feature related to Charts
Advanced editing of charts: precise control over chart display options that allow you to change elements of the chart such as data labels and the legend are paid features. If you use Office for free and receive a workbook which contains as customized chart, it will render in your Excel app. However, you will not be able to change chart elements unless you purchase a subscription.