I'm not a expert on this but hope the following could help a little.

I think some techniques similar to aircraft wing design could be used. The following paper adopted a cubic function interpolation to ensure smoothness in a wing-body geometric design (Equations 3 and 4 in the Section II-3). The interpolation between two span-wise sections was done based on one coordinate (y-direction here in their definition of coordinate)

https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/20170007963.pdf

For wind turbine blades, the following paper used a different way, the radial-basis function, and both x- and y-coordinates were independently interpolated to yield better results (Section 2.2):

https://iopscience.iop.org/article/10.1088/1742-6596/1037/4/042010/pdf

This is not my precise field of expertise but maybe this paper can help

Article DESIGN OF AIRFOILS FOR WIND TURBINE BLADES

Hi Hegespo,

Here, Luis and Hang had mentioned several research articles related to interpolation method. In addition to that, I would like suggest you one more research article - on FEA based airfoil shape blade design

https://core.ac.uk/download/pdf/1441516.pdf