Can I submit custom JVM arguments when starting the sandbox using the `daml` CLI?

Questions
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For example to control the heap size. If yes, what’s the syntax to use?

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There is no way to pass it via the CLI but you can pass it via environment variables. The standard environment variable that is supported by all JDKs is JAVA_TOOL_OPTIONS so something like export JAVA_TOOL_OPTIONS="-Xmx1g" before you run daml sandbox should do the trick. Depending on the JDK there are also some other environment variables, e.g., openjdk has _JAVA_OPTIONS which takes precedence over CLI flags if you really need that.

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