JIPI1

Depending on his attributes, PPM and physical profile, which you haven't listed, I would most likely use him as either Shadow Striker or Trequartista, like I would with Messi, Neymar, Maradona, Cruyff, Ronaldinho and most of the best attacking players in history.

Does he have any PPM? Just by being a playmaker role he's already prone to try and come near to the ball.

Sorry as I forgot that detail. From right to left. SK (de) WB (at) BPD (co) - He's on cover to open up space on the right for the halfback BPD (de) CWB (su) - Complete Wingback due to Barco being a superb ball player with 19 vision and such RDM is a HB LDM is either Regista, DLP or RPM depending on player, I prefer to have a more dynamic playmaker like Enzo Fernandez here playing as a Regista and roaming for space Both Wingers are Inverted Wingers on support with instructions to sit narrow, plus with Overlap TI they come inside to allow the wingbacks to occupy the wings on the line of 6 Attacking Midfielder is currently a Trequartista but any role will fit here, I use it to make the most of Neymar Forward is Attacking Forward but again any role will do, you can even go with False 9 and swap the Att Mid to Shadow Striker I think that's it. Oh and both centrebacks are encouraged to dribble more to make use of free space and drag defenders out of position. Feel free to ask any questions

This is how I achieve it

Try it out and see for yourself. It sounds like it can work as a mean of facilitating your buildup.

Those two formations focus on stretching the defensive line of the opposition while creating overloads on wings and numerical superiority on the build up, so I'd start by looking at those principles and thinking if you're happy with them or would rather focus on something else. Another thing to consider is that the 3-1-6 focus on using a playmaker to craft quality passes to the front "6" while relying on the back 3 to cover and recycle. So another thing to consider. Lastly, you'd perhaps be interested in a hybrid formation where one player can at one moment be a build-up support piece and the next become a rampant menace. Roles like inverted wingback, false 9, shadow striker, raumdeuter fit that profile.

Defensive line in the shape determines how high/deep the D-line positions itself. Defensive line option determines how the D-line behaves when the opposition is attacking you (eg. step up and be proactive in recovering the ball versus being reactive and holding the position to force the opponent to a mistake or turnover). This is my interpretation. Thoughts?

Try using the automatic duty on the wingback player role and check if it's possible then.