Laravel uses orm + query to construct concat

Problem: we hope to use laravel's orm and query structures (without raw native SQL statements) to use concatSQL statements like this: selecta, B, concat (a, B) fromtable, however, it seems that no relevant method has been found to express such a statement. Ask the experts who have experience in this field... problem:
We hope to use laravel's orm and query structures (without raw native SQL statements) to use concat SQL statements like this: select a, B, concat (a, B) from table, however, it seems that no relevant method has been found to express such a statement. Ask the experts who have experience in this field. The format is as follows:

Table: where (...)-> get ();

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Problem:
We hope to use laravel's orm and query structures (without raw native SQL statements) to use concat SQL statements like this: select a, B, concat (a, B) from table, however, it seems that no relevant method has been found to express such a statement. Ask the experts who have experience in this field. The format is as follows:
Table: where (...)-> get ();