It is common to specify a context when talking about the usage of some words.
In some posts, such as (Which tense does "just now" correspond to, past simple or present perfect?), the preposition "in" is used.
In this context, which tense should I use ...
In some other posts, the preposition "for" is used. That sentence could have been rewritten as
For this context, which tense should I use ...
Google Ngram implies the former is more common
When refer to a context, which preposition should I use, "in" or "for"?