PVC angle trim is made from rigid material, and over a long length it may flex slightly. It is not a soft material and cannot be coiled. Ideally you would need a sample of the material you are wanting to bend and then you can test the properties of that particular profile.
Plastic angle trims, such as those offered by MKM Extrusions, are manufactured from an external grade rigid PVC, so they are not soft and cannot be coiled. Using a heat gun to bend PVC trim is discouraged, as it softens the plastic unevenly and can lead to warping or a permanent loss of structural integrity. For most applications, it’s best to work with the trim in its original, straight form.