why ios keyboard text replacement works badly for pinyin

Regarding the keyboards—text replacement issue when using pinyin keyboard ,for example, I replace w with !weibo at keyboard settings, apple English keyboard can display the replacement text !weibo if i type w in spotlight ,but apple Chinese pinyin keyboard can't display the replacement text !weibo at spotlight ,and it can’t display at the first position when I type w at other place ,it's quite inconvenient for Chinese users. (Even Gboard is better than apple keyboard, Gboard can display the replacement text ),when can you make a change for Chinese users? Thanks.