print() is a mongo shell function implemented in C++ that currently prints all its serialized arguments joint by a space. Internally, print() uses LOGV2 logging API in a 'plain' mode. Optionally, we could switch between the 'plain' and 'json' mode of LOGV2 output depending on the value of the global TestData.logFormat property similar to what we did in SERVER-100041 for the uncaught exceptions.

Our test logging function jsTest.log.info(), jsTest.log.debug(), etc. currently use print() to output the result imitating the LOGV2 format, however, should print() switch to the JSON output, we will need an alternative function printLog(severity, msg, attr) to be called from jsTest.log.info(), jsTest.log.debug(), etc.