Guid RatingsFieldGuid_AverageRating = new Guid("5a14d1ab-1513-48c7-97b3-657a5ba6c742");
             Guid RatingsFieldGuid_RatingCount = new Guid("b1996002-9167-45e5-a4df-b2c41c6723c7");
             Guid RatingsFieldGuid_RatedBy = new Guid("4D64B067-08C3-43DC-A87B-8B8E01673313");
             Guid RatingsFieldGuid_Ratings = new Guid("434F51FB-FFD2-4A0E-A03B-CA3131AC67BA");
             Guid LikeFieldGuid_LikedBy = new Guid("2cdcd5eb-846d-4f4d-9aaf-73e8e73c7312");
             Guid LikeFieldGuid_LikeCount = new Guid("6e4d832b-f610-41a8-b3e0-239608efda41");

Connect-PnPOnline –Url https://tenant.sharepoint.com/sites/jerrydev/ –Credentials (Get-Credential)
$list = Get-PnPList -Identity "ratinglist" -Includes SchemaXml
$list.SchemaXml