The Jetson Nano carrier board uses TXB0108 bidirectional voltage-level translators on the GPIOs to go from the module’s 1.8 V levels to the headers 3.3 V levels. The data sheet for the TXB0108 states “With regard to capacitive loads, TXB translators are designed to drive up to 70 pF without issue.” The capacitance of my test leads is above 70 pF, so I tried an oscilloscope with 10 MΩ, 16 pF probes and the Jetson Nano outputs work fine. With both the multimeter and oscilloscope connected, I get a 56 MHz oscillation on the outputs. The multimeter reads the average, which is ~1.55 V.
The TXB0108 also has a 4 kΩ output impedance. That combined with the 70 pF capacitance limit means that any load on the Jetson Nano’s GPIOs should be both high impedance and low capacitance.