Hi,
I suppose that all the on-chip DACs for MCU are voltage output DAC instead of current output DAC.
For you application of iDAC, you can use on-chip DAC of MCU to output voltage from DAC_OUTPUT pin, then connect the DAC_OUTPUT pin to an external OP AMP and a transistor/MOSFET to output current.
The MCXN fanily has 14 bits resolution on-chip voltage output DAC.
https://www.nxp.com/products/processors-and-microcontrollers/arm-microcontrollers/general-purpose-mc...
The other family, for example LPC84x low cost MCU also has on-chip voltage output DAC.
Hope it can help you
BR
XiangJun Rong