You could put an explanation in the additional comments section, but the UC’s are aware of different International programs and their limitations.
Like I stated above, since the UCLA is such a competitive school to get admission, you want to try to be as “competitive” of an applicant as possible and there a different ways in which to meet their minimum requirements. If it is not possible to supposedly meet this one requirement, then all you can do to is apply as is and see what happens.
Below is a summary of last year’s admitted students profile and the # of semesters of a-g courses the applicants had taken when applying. The minimum of 15 year long (30 semesters) of a-g courses is far exceeded:
A-G” Courses Completed by semester:
50+= 20.0% (9,665/48,269)
40-49= 12.0% (4,731/39,439)
30-39= 6.2% (235/3,796) 8.9% (44/494)
Below 30= 8.9% (44/494)