Yes, in PLECS Blockset, you can calculate complex numbers in the Model Properties initialization section as in any MATLAB script.
Please note that there is a parenthesis mismatch on lines 24/25 and 36. Additionally, MATLAB recommends writing the imaginary unit as 1i or 1j to avoid confusion with variables.
However, it’s important to be aware that PLECS itself does not support complex numbers. For further information, please refer to the following post: Obtain PLECS parameter initial values from a .m file