When multiple adjectives each do not modify a noun separately, they are cumulative. Do not use a comma to seperate cumulative adjectives in English. This rule may be different in your mother tongue but when translating into English, we should all follow the rules & conventions of English language.

E.g.: The company is planning to open five new mid-sized stores by May next year.

Incorrect: The company has ordered an expensive, mini coffee machine for the new CEO.

Correct:    The company has ordered an expensive mini coffee machine for the new CEO.

You can refer to A Writer’s Reference (8th edition) by Diana Hacker and Nancy Sommers (2017) for further reading on this topic.