Working with drop-down list(dynamic list)

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I have three different independent entities, I want to populate one of the attribute of those entities in drop-down list.How I could do that ? Note:- There is no association between the entities, if association is there we can do it by references. Correct me if I am wrong?
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2 answers
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Example

Entity1/2/3 are extensions of the dropdown entity. This way you can populate the dropdownvalue attribute with any desired value.

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a drop down can only contain one attribute from one entity by default.

Create a generalization entity with a reference to the parent object and the attribute type to display in the drop down. Let the three entities use the generalization entity as a generalization.

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