Define delta function (point source, Green's function of Poisson equation) in fenicsx

[Yankang_Liu]

Hi I am collecting ideas to define the delta function. I found two related post (Delta function in fenicsx) and (Dirac delta distribution (dolfinx)) using approximations.

Is there any other ideas to define a delta function?

[francesco-ballarin]

See for instance Point Sources (Redux) - #4 by zaccandels