Combined / Complete firmware BIN file

Hey all:
I would like to know how to get a combined / complete BIN file in order to send to users and upload with the esptool.
I solve the problem sending the 3 files:
bootloader_dio_80m.bin in 0x1000
partitions.bin in 0x8000
firmware.bin in 0x10000
The idea is sending only one file
firmware.bin in 0x0
How can we do it in PIO?

Thanks for the PIO team for the very usefull job they do.

Júlio Silva