Macro impl_block_properties_parser 

macro_rules! impl_block_properties_parser {
    (@build_or_chain $first_parser_var:ident) => { ... };
    (@build_or_chain $first_parser_var:ident, $($rest_parser_vars:ident),+) => { ... };
    (
        $any_property_let_name:ident: $PropEnumType:ty = {
            $(
                $var_name:ident = $parser_call_expr:expr => $value_mapper_fn:expr
            ),+ $(,)? // Allow trailing comma
        }
    ) => { ... };
}

Macro to define individual property parsers and combine them with .or(). When this Macro is used, it is necrssary to have chumsky’s .or() and .map() in the scope.

Usage:

impl_block_properties_parser! {
    // Output variable name for the combined parser: Its type will be Box<dyn Parser<..., Output = $PropEnumType, ...>>
    any_property_variable_name: YourPropertyEnumType = {
        // var_name = parser_call_expr => enum_variant_constructor_or_mapper_fn
        p_some_bool = some_parser_that_outputs_bool("some_key") => YourPropertyEnumType::SomeBool,
        p_some_num  = some_parser_that_outputs_u32("num_key")  => YourPropertyEnumType::SomeNum,
        // ...
    }
}