opt期间volunteer与专业相关/不相关？？

楼主十二月底毕业，二月底opt要开始了，目前找了一家ngo volunteer。我是统计系，ngo开的title和专业不太符合：Finance Assistant，但是看job description，也是有analysis report要做。不知道找到全职工作申请h1b的的时候，移民局会不会觉得我在opt期间从事了和专业不相关的工作，从而被拒。
下面是Job description。大家觉得有风险吗？如果确实和我专业不太相关的话，我想我可以让雇主出具一封信，解释这个职位和我专业相关，这样的话风险还大吗？

或者有大佬需要data analyst的volunteer可以找我！


Responsibilities And What You Will Do:
    -Complete the day-to-day financial department tasks as requested
    -Enter data into the online system
    -Prepare a balance sheet
    -Update financial records
    -Processing invoices
    -Prepare cost analysis reports for other departments
    -Complete any other tasks as needed.
Here’s what we’re looking for:
    -Bachelor’s degree in finance, business or another relevant field preferred
    -Be available to volunteer 8-10 hours a week
    -Work well in a team setting
    -Detail oriented
    -Excellent communication and problem-solving skills

关于data analyst volunteer，请问您这边还有机会吗？谢谢