How to parse string into react-native Component?

I want to parse a string containing jsx into react-native Component

Example:

const str1 = "Hi I am default text <Text style={{fontWeight: 'bold'}}>I am bold text</Text>";

Now I want to render it like below:

const App = props => {

  return (
     <View>
       <Text> {str1} </Text>
     </View>
  );
}

I should note that, the above code works if I change it to:

const str2 = <Text>Hi I am default text <Text style={{fontWeight: 'bold'}}>I am bold text</Text></Text>;

but per my condition str1 can be only string, because I am taking it from TextInput Component.

Expectation: str1 should be parsed like below:

Hi I am default text I am bold text

What is my goal ?

I want to create a post, within my app, think the post text is:

Hi friends How are you please Like the post.

As you can see Like is bold an italic, so I want to make something like this.