Convert Predictive model into Rust

Is there any way to convert Python or R or java machine learning model into Rust format? So that it can be used in rust based app.

It all depends on how you've done things and which libraries you use (e.g. some libraries have bindings in several languages). Rust, Python, Java, and R are all turing complete languages so it's feasible enough to take a program written in one language and rewrite it in another.