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I didn't have the space for real hugelkultur beds,
https://www.permaculture.co.uk/articles/many-benefits-hugelkultur
and,
only found out about them after building raised beds in our garden.
Subsequently I have dug out the raised beds, sometimes just a trench of 1/3 width
and incorporated logs and shredded/mulched wood upcycled from the local (municipal)
golf course burn site,
in effect having a layer of slow release organic material in the bottom of the raised bed.
I think I can persuade myself we get better cropping of salad vegetables,
better drainage, (soil is improved from 'London Clay'), in the top layer,
and better moisture retention in the lower layers.
(raised beds are nominal 18 inches deep, when turned over, before inevitable soil settlement).Worms seem more plentiful, and some are much bigger than typical garden worms.
If you have some logs, and can shred some woody material it might be worth trying on one of your raised beds.
I shall await their snotty email. If they tell me in the next few years I can still move it.
I'm waiting for their bulk soil delivery so I can start planting out.