GIN index partial match

Hi:I create a gin index for a bigint array. and then  want to find the array which contains the key is start with special prefix. for example:
row1: { 112, 345, 118}row2: { 356, 258, 358}row3: { 116, 358, 369}
I want find the key start "11",so the row1 and row3 will be return.of course it must be use GIN index not seq scan。

is there any example ?

Thank You!