add default value for selected variable in the input field

[TrieuLe0801]

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1. Is this request related to a challenge you're experiencing? Tell me about your story.

I set a selected variable with the boolean type (True/False), but the variable cannot set the default value, so it only gives an empty or null value. I hope the select-type variable can be set as a default value for the new version.

2. Additional context or comments

No response

3. Can you help us with this feature?

• I am interested in contributing to this feature.