WP Image Mask

Select your image (or add a new one from Gutenberg blocks).

Select the type of image mask from the block's settings.

If you choose a custom image - click on the Choose mask image button to upload your custom mask.

Once you have selected the mask - it will apply to your image.

If you choose SVG code - paste your SVG code in the textarea field.

Once you have pasted the code - it will apply to your image.

You can also apply image masks to gallery's images.