Needed assistance in ATmega256 arduino bootload by ICSP port

I am in need of assistance with bootloading my ATmega256 Arduino through the ICSP port. I have a specific bootloader in mind and require guidance in implementing it. I prefer to use a programming language other than C++ or Python. Additionally, the ATmega256 will be integrated into a device that falls under the "Other" category. Ideal skills and experience for this project include: - Extensive knowledge and experience with ATmega256 Arduino bootloading - Proficiency in a variety of programming languages - Experience integrating ATmega256 into devices beyond robotics or home automation