Most of the NES games that I've played around with have had a stack of sprites in a grouping near the end of the ROM data. Being very much a non-expert, this is the only method I know, but it worked fairly similarly if using TLP or TM.
This is a screen shot of a CFL mod, but it should still be fine to illustrate the location of the fonts.
Actually I might as well mention that I had a moment of uncertainty that this would work, but it turned out that I accidentally had a mod for TSB3 for the SNES mixed in with my NES folder. So this will probably work as long as you are talking about the original Tecmo Super Bowl. </disclaimer>