MeshGenerator to define a node set for all the nodes of a subdomain

[vabufano]

I am currently working on a transient seepage analysis where I need to modify the pore pressure distribution in a specific region of my model. My model is divided into two subdomains: an upper one and a lower one. I have an initial hydrostatic pp distribution across the entire model.
For the upper block, I want to apply a specific time-dependent boundary condition: from the start of the analysis ($t=0$) to $t=1$, the pore pressure at all nodes within this upper block should transition from their initial hydrostatic value to a value of $0$.
I need a way to create a NodeSet that encompasses every single node belonging to a specified subdomain so that I can apply this BC.
I have found the following MeshGenerators: SideSetsBetweenSubdomainsGenerator and SideSetsAroundSubdomainsGenerator.
However, these generators define sets for element boundaries, not for all internal and boundary nodes of the block itself.
Is there a built-in MOOSE MeshGenerator that creates a NodeSet comprising all nodes associated with a given block ID?
While I could potentially use a ParsedGenerateNodeset for a simple box geometry, I would like to know if a subdomain-ID-based solution exists that will work with more complex geometries where defining the nodeset by explicit coordinates would be impractical.
Any advice on defining a node set directly from a block ID would be extremely helpful!

[GiudGiud]

Hello

Use a ParsedGenerateNodeset with the included_subdomains parameter.
You can see the parameter in the parameter group for restrictions on this page
https://mooseframework.inl.gov/source/meshgenerators/ParsedGenerateNodeset.html

[vabufano]

Thanks!