How to customize the activation time selected by the long button in iOS's Webview?

our APP type, uses Webview to render text content, we have a function is to long press the selection, and then save some text.

for the current long press, it always feels like it takes a long time to activate, maybe 500 good seconds. We want to change it to 300 milliseconds. Excuse me, can this be changed? I couldn"t find the relevant documents.

Please help me.

Feb.16,2022
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