Missing Grammar check rules- Missing space between full stop and first word of the next sentence

[nnayar]

I am testing out for a few grammatical error conditions and not getting the desired results:

Missing space between full stop and first word of the next sentence:
Example:
Input: capitalizes.What does it do for missing spaces
Output: capitalizes.What does it do for missing spaces
Ideally, the output should have a space between the full stop and "What"

What is the best way to add this additional rule?

[myint]

language-check is a Python interface to LanguageTool so I think additional checks would need to be added there.