word usage - Using 'in charge' as a noun?

I have seen this similar question here, but my particular case seems to differ still. I wish to use the word or phrase in charge as a noun, not as a verb. So for example, I have this usage scenario:

I didn’t write an application letter. Instead, I went to their advertised premises, and asked to meet the in charge myself.

And perhaps, to stress the unusual usage of this term, I wonder if adding a little emphasis such as in:

I didn’t write an application letter. Instead, I went to their advertised premises, and asked to meet the in-charge myself.

Or italicising the term when I use it

I didn’t write an application letter. Instead, I went to their advertised premises, and asked to meet the in charge myself.

Might render such an application plausible or meaningful?

Which of the above should I use, and if none is legit, then what better, expressive ways can I put it?