How can you support custom fonts?

In short, we can’t. Due to the way fonts are handled in operating systems, there is no way for them to be submitted with the render job and them be found by the render nodes. All objects using custom fonts will need to be converted to shapes such that the font files are no longer needed. This conversion must be done prior to submitting your render job. In some cases, it may be desirable to do this for even “standard” fonts, as there can be mild variations from one OS to another.