wish to have one's ashes scattered
Used in contexts of end-of-life planning or funeral arrangements, expressing a person's desire for their cremated remains to be scattered rather than interred.
My mother had told her family during her lifetime that she wished to have her ashes scattered.
I hear that the number of people who wish to have their ashes scattered is increasing.
散骨 refers to the act of scattering ashes itself, while 散骨希望 specifically denotes the wish or desire for that act.
Compound of 散骨 (scattering of ashes) and 希望 (hope, wish). The term is a straightforward modern coinage reflecting contemporary funeral practices.