Hi Lisa,
There are no pre-built Check Layouts that use the MICR font. The pre-built reports are designed for pre-printed check stock.
I have not done this myself, but going off of how we'd do it in Dynamics NAV, which is very much like Dynamics 365 for Financials, if you create a custom layout and have the MICR font installed on your computer (you can purchase or download the font for free from various internet sites), you should be able accomplish what you're looking to do.
The individual(s) printing checks may also need to have the same MICR font installed on their workstations.
To create your custom layout, I'd recommend using RDLC layout (instead of Word layout), which would require using a tool like Visual Studio or SQL Report Builder.
I hope this helps!