Apologies in advance but I am a complete newbie in the garden!

I want to sew some grass where the previous owner had his garden shed.
When we removed the shed we found the ground cover in pea shingle.
I've tried raking as much as I can but it's firmly mixed in with the
soil.

My question is:

Is there a problem with sewing the grass into stoney ground?
Should I just try and rake the top layer stones away once the grass has
grown a bit?

Thanks in advance.

Charlie