MacOS keyboard snippets and non-alpha characters not working as expected?

I’ve got a TextExpander snippet to expand “[ ]” to :black_square_button: and “[ x ]” to :ballot_box_with_check:. I use this constantly for short-term task management or reminders within Google Sheets. This works great on my Mac, but not at all in the mobile Sheets app on iPad or iPhone, where I spend most of my work day. As a work-around I attempted to create a more iOS/iPadOS-friendly shortcut within the shared Preferences->Keyboard->Text shortcuts panel using parentheses instead of brackets (since parens but not brackets are always accessible in the Sheets toolbar with a single tap). Here, these inputs were accepted and both shortcuts are showing up as expected in the “replace” and “with” columns, but when I tap out these triggers on the on-screen keyboard, nothing happens. Any suggestions or other work-arounds? TIA…!