I don't think it is possible to have an infinitely long page. However you should be able to use no top and bottom margins. Then, when you are careful with vertical spacing, a page break might be invisible. This will then depend more on the printer driver, than on the report generator.
Other options might be to send printer commands in the printer's language directly to the printer port, or send some kind of metadata to a service or application that has more direct control over the printer.
Answers
Other options might be to send printer commands in the printer's language directly to the printer port, or send some kind of metadata to a service or application that has more direct control over the printer.