If you have good soil as it looks like you do, I wouldnt waste my time.
An option would be to put a border around the garden and just add compost to it every year.
The reason I say this is because in my area a raised bed invites root growth from the trees and once the roots are in the beds the only option is to romove the beds and get rid of the roots.
I cant even set a planter on the ground without out the roots from the elms growing into it.
If you do, put something down first to stop the outside roots.
Worth
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