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I am a decorator....
You can use silicone but when it comes to repainting the wall, you won't be able to paint over the silicone.
For a 2mm gap, I would recommend an acrylic sealant that matches the colour of the wood.
Eg https://www.solmer.co.uk/hardware/unika-colorsealant-310ml.html
Use low tack tape on the wall and run the sealant, smooth off with a damp J-cloth. It will shrink back slightly. If you are unhappy with the shrinkage, repeat the process.
What's the diff between a low tack tape and painter's tape (masking tape)?