MAX10: JTAG ISP

I plan to use a MAX 10M02SCE144I7G FPGA on my next PCB. FPGA code will be generated by Quartus. I know how to programm FPGA by using external JTAG header, but I want to programm FPGA with a Microprocessor via ISP. Is there another possibility to programm FPGA without using JTAG? What solution whould be the easiest way to implement a ISP for MAX 10 connected with a Microprocessor?