I’m not too sure. I’d imagine you could include it in your Will if you wish. Although It would be pretty hard to have it enforced with them being personal preferences. It’s not like assets which are more tangible rather than personal.Can that information be included in your will, or does it need to be separate?
As an example you can’t force someone to be a pallbearer, which is what a will would require, you can have a preference for someone to be a pall bearer, where they have the right to say no, so you can replace that person with another if need be, without breaking the will.
You’re probably better off talking with family and friends on your wishes for when you die or writing down on a piece of paper what you wish to do. With instructions regarding arrangements, songs that you would like played ect.
With what I’m going through with my mum at the moment, it’s got me thinking of writing a Will, look at some sort of life insurance policy, start thinking about my own arrangements just in case, so that people will have an understanding of my wishes