For now it's not possible.
As it's completely depend on their operating system API's and customisation. Even developers have requested for this on XIOMI's official forums but there is no response from there side.
Till now even i am finding an answer to this question but nothing helped me.
For the time being it will be only possible for rooted phones. i.e. making customisation in their firmware by becoming super user. But this is not at all advisable as it may damage user's phone.
EDIT 1
You can redirect user to autostart permission's settings page for enabling your app using following code
String manufacturer = "xiaomi";
if (manufacturer.equalsIgnoreCase(android.os.Build.MANUFACTURER)) {
//this will open auto start screen where user can enable permission for your app
Intent intent1 = new Intent();
intent1.setComponent(new ComponentName("com.miui.securitycenter", "com.miui.permcenter.autostart.AutoStartManagementActivity"));
startActivity(intent1);
}
EDIT 2
I have recently used Mi A1 from XIOMI which have stock android (not miui) so this phone does not have autostart permission
settings from miui. So take care while navigating user to the settings in such devices because it will not work here.
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