The effects, as of now, will not be localized (although Avant may be working on something along such lines). An Androgen put into the Lipo Gel may work for such the purpose although the carrier is not ideal for such the substance.
Meaning that one could try, although it may not reap the fruit of one's expectations. BTW, some assumed "localized growth" when making application to their shoulders ("my shoulders had greater marginal gains relative to other regions") not taking into account the greater Androgen receptor density in that space of body.