BRAZIL - Related field of Study: Language and Literature to International Culture and Communication Studies

I am planning to apply for the MEXT scholarship, and I have a question regarding the field of study eligibility.

The application guidelines state: "Applicants should apply for the field of study they majored in at university or its related field(s)."

I graduated in a degree called "Letras" in Brazil, which is often equivalent to Language and Literature or Letters in other countries. My undergraduate thesis focused on the relationship between literature, politics, and socio-cultural studies.

Because of this academic background, I am interested in pursuing a master's degree in a field such as International Culture and Communication Studies.

My question is: how can I determine whether this change or expansion of field is considered sufficiently related to my undergraduate major and therefore eligible under MEXT guidelines?