Isn't that already good enough, symbols.c line 138:
/* table of predefined numeric equates */
static const struct eqitem eqtab[] = {
{ "__HJWASM__", _UASM_VERSION_INT_, NULL, NULL },
{ "__UASM__", _UASM_VERSION_INT_, NULL, NULL },
{ "__JWASM__", 212, NULL, NULL },
{ "$", 0, UpdateCurPC, &symPC },
{ "@Line", 0, UpdateLineNumber, &LineCur },
{ "@ProcLine", 0, NULL, NULL },
{ "@Arch", ARCH_AVX, NULL, NULL },
{ "@Platform", 0, NULL, NULL },
{ "@LastReturnType", 0, NULL, NULL },
{ "@WordSize", 0, UpdateWordSize, NULL }, /* must be last (see SymInit()) */
};