Yes, that can be done like so:

{
    "createdBy": "Redirector v3.5.3",
    "createdAt": "2023-06-01T00:00:00.011Z",
    "redirects": [
        {
            "description": "LemmyML to Sopuli",
            "exampleUrl": "https://lemmy.ml/c/memes ",
            "exampleResult": "https://sopuli.xyz/c/memes ",
            "error": null,
            "includePattern": "^(https?://)([a-z0-9-]*\\.)?lemmy.ml/(.*)",
            "excludePattern": "",
            "patternDesc": "",
            "redirectUrl": "https://sopuli.xyz/$3",
            "patternType": "R",
            "processMatches": "noProcessing",
            "disabled": false,
            "grouped": false,
            "appliesTo": [
                "main_frame"
            ]
        }
    ]
}

Copy that to a file, save it and then import into Redirector.