This riclpmr package is a set of tools for creating lavaan-style model specifications of Random Intercept Cross Lag Panel Models for arbitrarily large numbers of constructs and measurement occations.
It also contains a helpful function for passing this model specification to the appropriate lavaan or blavaan function.
See this blog post for more information about the model.
To install:
devtools::install_github('jflournoy/riclpmr')