In order to save the size of exported SVG file, I want to reuse a symbol but how could I do that with Sketch?

Question

I am using Sketch 70.2 (so far the latest version).

I have a symbol and two instances on the stage:

However, when I exported this, the exported SVG didn't take advantage of reusing that symbol. It would boost the SVG file size especially when the symbol is very complicated.

Is there any way/settings to tell Sketch to do so?