It appears that JLC is mostly using the EIA standard for orientation. EIA seems to be the most widely used in the industry, which is unfortunate because it isn’t predictable or consistent. The orientation changes depending on the part type e.g. tantalum caps have a different polarity than diodes.
KiCad libraries appear to use the IPC standards, which consistently put pin 1 in the upper left quadrant or on the left for two pin parts.
Ref: EIA-481-D standard, IEC61188 standard, IPC-7x51 standards.