If you were married on 12/31/2020, you are considered married for the whole year and can file as Married Filing Jointly.
You are correct that if Married Filing Separately you would normally each report only your income/taxes paid on your individual returns.
When you live in a community property state and file separate returns, you each must report 50 percent of your spouse's income and half of income generated by community assets, plus all of your separate income.
Click this link for more info on Filing Separately in a Community Property State.
You may want to test both joint and separate filings to see which one benefits you the most.
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