how to suport jasminum officinale

You either allow it to grow through another shrub or you need to providehorezontal wires and tie it back to them.

Hmm, well dunno about horizontal wires, in my experience, this plant is rampant and gets 35 feet by 15 feet rather quickly. I'd suggest a very strong, rigid trellis section/s, such as those sold as fencing panels (6 x 6 feet) fixed very securely.