Hello,
I want to make a custom recipe for seeds with soul jar on crafttweaker. But I don't have the ID of specific soul jar with specific entity. Can you help me please?

You should be able to see the mob soul type ID in the tooltip of the filled soul jar in JEI if you have advanced tooltips enabled (f3 + h).

Hello,
I want to make a custom recipe for seeds with soul jar on crafttweaker. But I don't have the ID of specific soul jar with specific entity. Can you help me please?

take the soul jars with the souls out of JEI and u get the exact id via /ct hand
Guardian soul as example look like

item:mysticalagriculture:soul_jar.withTag({Souls: 10.0 as double, Type: "industrialagriculture:guardian" as string})