Hello,
i bought a liner for my 2019 250h from this site. They are made in Poland and are excellent quality and fit perfectly. They have models for 250h and 300e up to MY2024.
I attach the link and a picture, the site is not in English but it's easy to navigate. https://www.tappetinionline.it/vasca-baule/lexus/ux/
You have to choose the 250h model.
I bought the model that has rubber on top and an underside finish that won't let the liner move in the booth. On the site is called DuoGrip Gomma.