How to change the value of transparency when start a animation of image zoom?

Description

Now i can make a image zoom animation,but i want to make a transparency animation in the same time , just like zoom and angle together.

What MCU/Processor/Board and compiler are you using?

IMXRT1052

What LVGL version are you using?

v8

What do you want to achieve?

What have you tried so far?

I get the value of zoom when the zoom animation is running .Then i set the image’s style use
void lv_style_set_img_opa(lv_style_t * style, lv_opa_t value) .But the transparency didn’t change .