Vexing problem...I tested this against your input with a '.' (parsed) and a string with '_' (rejected).

"$.errors[(\"error.loaderFailure\")][*]"

I have another question:

Is there a way to group everything under one path? Using the above example with a modification:

{"errors":{"error.loaderFailure":["This is a row of error data", "Another row of erroneous data."]}{"error.anotherTypeOfFailure":["This is a third row of error data", "The last row of erroneous data."]}}

So, let's say I want to grab everything that is at $.errors.*

My output would be:
This is a row of error data
"Another row of erroneous data.
This is a third row of error data
The last row of erroneous data.
--
This way, I can avoid having errors of the tFileInputJson component not finding the specific path? Since the errors that come back through JSON can be a wide variety of kinds of errors I've had this error: "Can't find any data with JSONPath $.errors[("error.genevaLoaderFailure")][*]". But there were infact errors coming back, just different kinds.

If this is not possible, I suppose they'd have to implement a "Ignore Missing Path" option in the tFileInputJSON component.

Thanks