Could I plant anything under my

Totem pole, we are digging as fast as we can, but I need more space 

Can we use the space under the bean frame for anything.

its quite shady as it backs onto a large and very overgrown council border.

I dont need to grow anymore lettuce so something else would be great, I have beetroot, caulis, squash, courgette. etc etc

I think spinach doesn't mind a bit of shade, well I'm sure too much sunlight can cause it to bolt, so presumably shade will help?