If the current limit of a MKR Wifi 1010 board i/o pin is 7mA, do not try to take more than that amount.
You mentioned you tried a LED without a current limiting resistor.
Doing this, the LED will damage the i/o pin.
If the controller is powered by 3.3 volts:
- (3.3V(Vcc) - 2v(LED) ) ÷ 7mA ≈ 185 Ω this will be the safe resistor to get 7mA current flowing.
“ Can I assume correctly that the board has a current limiter for each pin? ”
No.
There are high efficient LEDs that are very bright at 5mA.
“I also see the pin group maximum current is 65mA per group.”
Port