7u case with 1u Line *In* module - any way to use it as a Line *Out*?

I have a 2nd 1u Line Out on the way. In the meanwhile I was thinking… perhaps would it be possible to use the Line In that I have as a Line Out?

It didn’t seem to be as simple as just plugging it in as such. But considering how simple the problem is in concept I thought I might as well see if it’s possible in execution.