get undeclared variables names

[aiekick]

Hello,

im creating a geometry node in blender 3d for create parametric surfaces and im using your famous library.

btw i would like to use any formula, by ex with a formula (with predefined params u and v) :

cos(v) * ( r0 + r1 * cos(v) )

can be usefull if i can get the var names r0 and r1.
like that, i could bind them to some double var and recompile the expr.

is there a way to achieve that ?

for ex, here the current node : https://twitter.com/aiekick/status/1412574701587738626

Thanks