On desktop PC, there are great apps / Chrome addons such as Gorgias that allows to write
abc <TAB> and this will be automatically expanded into a long text, thus saving many keypresses.
On Android, there is Texpand app that does mostly this, by using accessibility features of Android.
Problem: it works when writing a SMS, but this doesn't work in text fields on web pages (for example in Chrome, while using gmail.com). (the Texpand FAQ item 3 says it doesn't work and I can confirm).
Sadly this is exactly where such an add on would be the most useful: to write emails faster on phone.
Question: how to have text expansion on Android in Gmail?