If the single-member LLC has not made an election to be treated as a corporation for federal income tax purposes and the trust is a grantor trust, then both are disregarded for federal income tax purposes and you can use one of the optional methods of reporting without the need to file a Form 1041.
See https://www.irs.gov/instructions/i1041#en_US_2022_publink1000286018
If you are filing a 1041, regardless, then the income is simply reported on the 1041 since the single-member LLC is disregarded for federal income tax purposes (i.e., the income/gain is reported as if received directly by the trust).
