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Pronouns aren't typically capitalised in a sentence except at the start. As for an acronyms, that really is covered by the other suggestion that I linked to (the term used there is abbreviations but that really covers acronyms too).
Sentence case does capitalise the first word, which is what you want, so this feature already exists. If you are also wanting acronyms/abbreviations to remain capitalised, then this suggestion is a duplicate of this one: