You can't unlock the bootloader. Don't bother with it. If you want something proper, get any device that's NOT from China, and especially form Lenovo (which is Motorola now).
**** LENOVO **** CHINA FREE HONG KONG.
I beg to differ, as in developer option on the moto e6 plus there is a toggle for OEM unlocking,
I believe you need to get a code from Motorola to complete the unlock though,
I have not yet tested as I want to preserve warranty,
However with my moto e4 I was able to unlock bootloader and root without any issues,
Hell at one point I had to rebuild the entire system from an empty chip, (OS took me 4 Days) including rewriting the original imei numbers (that took me 2 weeks)
So no, lenovo is not as locked down as you seem to think it is,
As a side not, most phone are made with components that are built/assembled in China so it is actually quite hard to get a device that isn't at least partially made in China,