Can IntelliJ treat a Java text block as syntax such as SQL or XML to assist editing/formatting?

Java 15 brings us the new JEP 378: Text Blocks feature. This eases working with multi-line strings.

Can IntelliJ be made to parse the text within that block as some kind of syntax? Is there a way for me to tell IntelliJ that a text block is SQL source code or XML data?

If so, can IntelliJ use its code-editing superpowers to assist with colorizing, editing, and formatting the code nested inside my Java via that text block?

You can use Language Injection feature.

You can specify the intended language embedded as a text block by including either a Java comment or a Java annotation. See IntelliJ documentation: Language injections.

Comment

eg:

// language=JSON
"""
{
   "field1": "text,
   "field2": 123.43,
   "field3": true
}
"""

Should be interpreted by Idea as JSON and highlight errors:

See the IntelliJ documentation, Use language injection comments.

Annotation

Alternatively, you can use the org.intellij.lang.annotations.Language annotation if you add JetBrains Annotations as a dependency on your project.

@Language("JSON")
String json = 
    """
    {
       "field1": "text,
       "field2": 123.43,
       "field3": true
    }
    """ ;

Find the Maven coordinates in a repository like this.

<!-- https://mvnrepository.com/artifact/org.jetbrains/annotations -->
<dependency>
    <groupId>org.jetbrains</groupId>
    <artifactId>annotations</artifactId>
    <version>24.1.0</version>
</dependency>