Android Question sending Telegram message

hi guys,

i have a solution that sends text messages according to the user's choice
i support SMS
now i support WhatsApp & WhatsApp W4B

i now need a way to send a text message using telegram (from the user's device)
i can identify if it is installed and then to offer the telegram as an option

i have the target's phone number and the text to be sent

i don't want to use a bot or any external service - it has to go directly from the user's phone

any one can help?

thanks