I found multiply operation in matrix)
import Metashape
chunk = Metashape.app.document.chunk
# Store position
old_pos = chunk.region.center
# Get offset by x size
x_offset = Metashape.Vector([chunk.region.size.x, 0, 0])
# Rotate offset vector
new_x_offset = Metashape.Matrix.Rotation(chunk.region.rot).mulv(x_offset)
# Make offset of reconstruction regionchunk.region.center = old_pos + new_x_offset