How do I change the masonry blog style to use my custom typeface I uploaded?

I am trying to target my blog post title and read more font to be one of my custom ones.

This is - PlusJakartaSansReg

Please see attached screenshot, I can't share the page as its in a members area

Its currently inheriting one of the custom fonts automatically, but not the one I want to use 

Any help would be hugely appreciated 

@tuanphanmanaged to fix thank you