How to declare a static array with variable length in delphi?

I need an array, that is optimized for one-time-initialization at runtime, with a given length. So memory should be allocated at runtime, but I don't need to change its length.

Is there a array-type other than the pure dynamic array? (it seems to be not the optimal choice for this task)

Bonus would be, if the initialized array is indexable via pointer-iteration, so all it's elements are allocated consecutive in memory.

Is this all just a daydream of a non-experienced programmer, or is there a possibility to achieve this?

I could imagine to do this with manual memory allocation, but maybe there's another way.