You could program one, but it is preferable to pick better starting values from economic theory or even better, provide an analytical steady state. See "Remark 15 (initval vs. steady_state_model vs. steadystate-file)" in Pfeifer(2013): "A Guide to Specifying Observation Equations for the Estimation of DSGE Models"
https://sites.google.com/site/pfeiferecon/Pfeifer_2013_Observation_Equations.pdf