This is the sense here. An important feature of the Hebrew text is not clear in most English translations. It is the basis for the presence of God that enables all the actions. In the Hebrew, he has sent me is the main verb controlling all the speaker's actions. This emphasizes that God has commissioned the entire message.
Various translations choose different words.
The basic idea is not just that a person is economically poor. This emphasizes that they are powerless in their circumstances to do anything about their condition. This is a difficult phrase in Hebrew because of a scribal error in the text. From darkness is not in the Hebrew. A major theme throughout the second and third sections of Isaiah is that God will again act to bring deliverance and justice to His people.