Associative Growth Mixture Model in OpenMx

Is it currently possible to implement an Associative Growth Mixture Model in OpenMx? I was having a look at this paper from Hix-Small et al. (2004) where the authors are combining a multivariate LGM and a GMM to simultaneously
study the relationships among alcohol and marijuana use over time and investigate the existence of sub-populations.

I will probably need this approach to analyze my data, so just wondering if there is an alternative to Mplus.

Thanks

Hix-Small et al.'s (2004) [paper here](https://www.researchgate.net/publication/226551720_A_Multivariate_Associative_Finite_Growth_Mixture_Modeling_Approach_Examining_Adolescent_Alcohol_and_Marijuana_Use)