I have created a Microsoft Teams configurable tab with Angular and the Microsoft Teams Javascript library. From this tab I would like to be able to click a button which will "pre-compose" a message in the chat of the channel/chat of where the configurable tab is installed. So when the button is clicked, Teams should navigate to the "Posts" tab of the channel/chat and fill in the text/url/string in the chat and let the user decide to press enter to send it.
I've read the documentation but I cannot conclude that this is possible. I've looked at creating a task module but this only seems to be able to open dialogs to get the user to fill in data and call a service. The bot documentation also seems to mention filling the compose box of the chat but the documentation is not very clear in specifying how the bot should be called from e.g. tabs.