Parameter.kt

inline fun String.asParameter() = "\$" + this

infix fun String.Companion.asParameter(s: String) = "\$" + s

ParameterTest.kt

class ParameterTest {

    @Test
    fun `named parameters in multiline strings shouldn't be that hard`() {

        """
            MATCH (n:Something {n.name: ${"someParameter".asParameter()}}
            WHERE n.someProperty = ${String asParameter "someother"}
        """.trimIndent().apply {

            assertEquals("MATCH (n:Something {n.name: \$someParameter}\nWHERE n.someProperty = \$someother", this)
        };
    }
}

I would go with:

fun param(p: String) : "\$" + p

"""
MATCH (n: Node {n.name: ${param("someParameter")}})
"""

Or maybe p or P instead of param

Michael H. suggested p as well ;)
I'd say that's fine for a global method, but it's not something I'd attach to String…

I'm unsure how the Kotlin community thinks about it.