If you meant the dark input, it's not unevaluated. It's a read-only input, which means you cannot directly type into the input, and blocks must be inserted into.
To get the dark input, set to a desired input type (number, text, any type or what you want) and click the cog/gear icon on the bottom of the window. See the read-only toggle?
Nice modification!
It could benefit from the text not moving the pen, which could stem some problems when clicking the block multiple times. The only block you might need to add is just [scratchblocks]set x to (x)[/scratchblocks] at the end of the block definition.
The available fonts really depends on what fonts are installed on your device. There's no universal fonts, although there are fonts that tend to be on every device, so technically there are universal fonts. The only fonts that are not on every every device are evident by this topic.
I'm pretty sure I finished the library, so I embedded it into this image.
This version has (possibly inaccurate) Spanish, French, Portuguese, and Russian translations, along with one more block that builds off of the original stats block! Have fun with it