Detect the Already Typed Latin Word for Transliteration

With the stock EN-US keyboard, typing a Latin word and switching to the Malayalam transliteration keyboard while the cursor remains at the end immediately shows Malayalam script suggestions. The same script appears if a space follows the word and one backspace returns the cursor to the end. Could we have this feature? It is especially helpful when we begin a Latin word assuming the language has changed but remain on English. Currently, the Malayalam keyboard does not detect the existing word, so we must delete the Latin text and start again.