No - you need a mic preamp in between. Especially for the SM7B which needs a lot of gain.
i do this. I send my vocals through the Axe FX 2 to add midi controlled delay effects.
An SM57 works fairly well connected directly with an XLR to jack adapter.
But to avoid noise, especially with the SM7B, it's best to get a preamp.
I use this thing: https://www.ebay.com/sch/i.html?_from=R40&_trksid=m570.l1313&_nkw=OMNITRONIC+LH-045&_sacat=0
You should be connecting to Input 2, or set your Input 1 to "Rear", because it's currently just listening to the front input.